{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T22:05:53Z","timestamp":1791583553945,"version":"4.3.4"},"reference-count":43,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T00:00:00Z","timestamp":1779840000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003695","name":"Korea Institute of Industrial Technology","doi-asserted-by":"crossref","award":["Kitech EH-26-0008"],"award-info":[{"award-number":["Kitech EH-26-0008"]}],"id":[{"id":"10.13039\/501100003695","id-type":"DOI","asserted-by":"crossref"}]},{"award":["Kitech EH-26-0008"],"award-info":[{"award-number":["Kitech EH-26-0008"]}],"id":[{"id":"https:\/\/ror.org\/04qfph657","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100013128","name":"SME Technology Innovation Development Institute","doi-asserted-by":"publisher","award":["RS-2024-00469087"],"award-info":[{"award-number":["RS-2024-00469087"]}],"id":[{"id":"10.13039\/501100013128","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100013129","name":"Ministry of SMEs and Startups","doi-asserted-by":"crossref","award":["RS-2024-00487867"],"award-info":[{"award-number":["RS-2024-00487867"]}],"id":[{"id":"10.13039\/501100013129","id-type":"DOI","asserted-by":"crossref"}]},{"award":["RS-2024-00487867"],"award-info":[{"award-number":["RS-2024-00487867"]}],"id":[{"id":"https:\/\/ror.org\/022c4zk48","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The use of LIDAR sensors is rapidly increasing across various fields, including autonomous transportation, robotics, security systems, and biosensing. Among the core components of LIDAR systems, short-wave infrared (SWIR) sensors play a crucial role in detecting infrared light reflected from objects to recognize the surrounding environment and humans. Various types of SWIR sensors have been reported, with growing demand for those capable of detecting eye-safe infrared wavelengths above 1400 nm. In particular, quantum dot (QD)-based SWIR sensors are attracting attention due to their tunable wavelength range within the eye-safe region, narrow full width at half maximum (FWHM), and selective detection with minimal interference from other infrared wavelengths. Moreover, QD-based SWIR photodetectors can be synthesized and fabricated via solution-based methods, offering advantages such as low cost and ease of fabrication. However, the long organic ligands typically present on QDs exhibit insulating properties, limiting the sensitivity and stability of the photodetectors. To address this issue, organic ligands can be replaced with short inorganic ligands possessing superior electrical conductivity. In this study, the organic ligands of synthesized PbS QDs were replaced with the inorganic ligand methylammonium lead iodide (MAPI) in solution, and a SWIR photodetector was fabricated. The MAPI-capped PbS QD-based photodetector exhibited remarkable external quantum efficiency (EQE) of 62%, a responsivity of 0.73 A\/W, and a detectivity of 2.26 \u00d7 1011 Jones within the 1400\u20131500 nm wavelength range.<\/jats:p>","DOI":"10.3390\/s26113391","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T12:31:56Z","timestamp":1779885116000},"page":"3391","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["High-Sensitivity SWIR Photodetector Based on PbS Quantum Dots via Solution-Phase MAPI Ligand Exchange"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6496-2933","authenticated-orcid":false,"given":"Yuntae","family":"Ha","sequence":"first","affiliation":[{"name":"Advanced Mobility System Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea"},{"name":"School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JinBeom","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Semiconductor Engineering, Kyungwoon University, 730, Gangdong-ro, Sandong-eup, Gumi 39160, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saewan","family":"Kim","sequence":"additional","affiliation":[{"name":"Advanced Semiconductor Research Center, IT Materials & Components Research Division, Gumi Electronics & Information Technology Research Institute (GERI), Gumi 39171, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong Geon","family":"Jung","sequence":"additional","affiliation":[{"name":"Advanced Mobility System Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-0746-2052","authenticated-orcid":false,"given":"Daewoong","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Nanomechatronics Engineering, College of Nanoscience & Nanotechnology, Pusan National University, 2 Busandaehak-ro, Busan 46241, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"327","DOI":"10.1016\/j.mattod.2022.11.003","article-title":"Short-wave infrared photodetector","volume":"62","author":"Cao","year":"2023","journal-title":"Mater. Today"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"19701","DOI":"10.1039\/C8NR05781H","article-title":"High throughput near infrared screening discovers DNA-templated silver clusters with peak fluorescence beyond 950 nm","volume":"10","author":"Swasey","year":"2018","journal-title":"Nanoscale"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1063\/1.3184807","article-title":"Mesa-isolated InGaAs photodetectors with low dark current","volume":"95","author":"Klem","year":"2009","journal-title":"Appl. Phys. Lett."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"3338","DOI":"10.1063\/1.112384","article-title":"MBE growth of high quality InSb optimized using RHEED oscillations","volume":"65","author":"Michel","year":"1994","journal-title":"Appl. Phys. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"99","DOI":"10.1142\/S0129156402001678","article-title":"GaAs\/AlGaAs multi-quantum well based infrared focal plane arrays for infrared imaging applications","volume":"12","author":"Gunapala","year":"2002","journal-title":"Int. J. High Speed Electron. Syst."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/S0022-0248(01)02131-5","article-title":"Epitaxial growth of InGaAs on misoriented GaAs(100) substrate by metal-organic vapor phase epitaxy","volume":"236","author":"Takano","year":"2002","journal-title":"J. Cryst. Growth"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"787","DOI":"10.1063\/1.90952","article-title":"Observation of Vapor-phase epitaxial growth of InGaAs lattice matched to (100) InP for photodiode application Available to Purchase","volume":"35","author":"Hyder","year":"1979","journal-title":"Appl. Phys. Lett."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"105254","DOI":"10.1016\/j.nanoen.2020.105254","article-title":"Spray-deposited PbS colloidal quantum dot solid for near-infrared photodetectors","volume":"78","author":"Chen","year":"2020","journal-title":"Nano Energy"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"2003397","DOI":"10.1002\/smll.202003397","article-title":"Integrated structure and device engineering for high performance and scalable quantum dot infrared photodetectors","volume":"16","author":"Xu","year":"2020","journal-title":"Small"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1002\/adom.201300530","article-title":"Large gain, low noise nanocomposite ultraviolet photodetectors with a linear dynamic range of 120 dB","volume":"2","author":"Fang","year":"2014","journal-title":"Adv. Opt. Mater."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"37913","DOI":"10.1038\/srep37913","article-title":"PbS colloidal quantum dot photodetectors operating in the near infrared","volume":"6","author":"Venettacci","year":"2016","journal-title":"Sci. Rep."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1932","DOI":"10.1021\/acsphotonics.0c00594","article-title":"Zero-dimensional PbS quantum dot-InGaZnO film heterostructure for short-wave infrared flat-panel imager","volume":"7","author":"Choi","year":"2020","journal-title":"ACS Photon."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1016\/j.orgel.2016.03.023","article-title":"PbS quantum dot-based hybrid-organic photodetectors for X-ray sensing","volume":"33","author":"Ankah","year":"2016","journal-title":"Org. Electron."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"16100","DOI":"10.1038\/natrevmats.2016.100","article-title":"Solution-processed semiconductors for next-generation photodetectors","volume":"2","author":"Armin","year":"2017","journal-title":"Nat. Rev. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"180","DOI":"10.1038\/nature04855","article-title":"Ultrasensitive solution-cast quantum dot photodetectors","volume":"442","author":"Konstantatos","year":"2006","journal-title":"Nature"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1063\/1.1641165","article-title":"Terahertz range quantum well infrared photodetector","volume":"84","author":"Graf","year":"2004","journal-title":"Appl. Phys. Lett."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"161107","DOI":"10.1063\/1.3419885","article-title":"Plasmonic enhanced quantum well infrared photodetector with high detectivity","volume":"96","author":"Wu","year":"2010","journal-title":"Appl. Phys. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"851","DOI":"10.1063\/1.102682","article-title":"High sensitivity low dark current 10 \u00b5m GaAs quantum well infrared photodetectors","volume":"56","author":"Levine","year":"1990","journal-title":"Appl. Phys. Lett."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"332","DOI":"10.1038\/nphoton.2009.72","article-title":"Near-infrared imaging with quantum-dot-sensitized organic photodiodes","volume":"3","author":"Rauch","year":"2009","journal-title":"Nat. Photon."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1328","DOI":"10.1002\/smll.201503244","article-title":"Inorganic UV\u2013visible\u2013SWIR broadband photodetector based on monodisperse PbS nanocrystals","volume":"12","author":"Lee","year":"2016","journal-title":"Small"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1844","DOI":"10.1002\/adma.200305395","article-title":"Colloidal PbS nanocrystals with size-tunable near-infrared emission: Observation of post-synthesis self-narrowing of the particle size distribution","volume":"15","author":"Hines","year":"2003","journal-title":"Adv. Mater."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1805","DOI":"10.1021\/cm200051j","article-title":"Impact of the growth conditions of colloidal PbS nanocrystals on photovoltaic device performance","volume":"23","author":"Fu","year":"2011","journal-title":"Chem. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1186\/s40580-020-00238-3","article-title":"Air-stable and ultrasensitive solution-cast SWIR photodetectors utilizing modified core\/shell colloidal quantum dots","volume":"7","author":"Kwon","year":"2020","journal-title":"Nano Converg."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"20600","DOI":"10.1038\/s41598-024-71453-9","article-title":"Solution-processed NO2 gas sensor based on poly(3-hexylthiophene)-doped PbS quantum dots operable at room temperature","volume":"14","author":"Kwon","year":"2024","journal-title":"Sci. Rep."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2089","DOI":"10.1063\/1.1792380","article-title":"Photoconductivity from PbS-nanocrystal\/semiconducting polymer composites for solution-processible, quantum-size tunable infrared photodetectors","volume":"85","author":"McDonald","year":"2004","journal-title":"Appl. Phys. Lett."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"87730","DOI":"10.1039\/C6RA19946A","article-title":"High quantum yield and pH sensitive fluorescence dyes based on coumarin derivatives: Fluorescence characteristics and theoretical study","volume":"6","author":"Sulaman","year":"2016","journal-title":"RSC Adv."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1426","DOI":"10.1016\/j.proeng.2012.09.425","article-title":"PbS colloidal quantum dot photodiodes for SWIR detection","volume":"47","author":"Hevesa","year":"2012","journal-title":"Procedia Eng."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"066210","DOI":"10.1088\/2053-1591\/ab0fb5","article-title":"Electrical and optical characterization of quantum dots PbS\/TiO2 based heterojunction as a SWIR detector and a proposed design of PbS\/TiO2-PeLED as a SWIR to visible upconversion device","volume":"6","author":"Hechster","year":"2019","journal-title":"Mater. Res. Express"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"2201897","DOI":"10.1002\/adom.202201897","article-title":"Impact of ligands on the performance of PbS quantum dot visible\u2013near-infrared photodetectors","volume":"11","author":"Bothra","year":"2023","journal-title":"Adv. Opt. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"6135","DOI":"10.1021\/acsanm.9b00889","article-title":"Lead sulfide quantum dot photodetector with enhanced responsivity through a two-step ligand-exchange method","volume":"2","author":"Tang","year":"2019","journal-title":"ACS Appl. Nano Mater."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1002\/adma.201402471","article-title":"Hybrid 2D\u20130D MoS2\u2013PbS quantum dot photodetectors","volume":"27","author":"Kufer","year":"2015","journal-title":"Adv. Mater."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1706690","DOI":"10.1002\/adfm.201706690","article-title":"Hybrid organic\/PbS quantum dot bilayer photodetector with low dark current and high detectivity","volume":"28","author":"Wei","year":"2018","journal-title":"Adv. Funct. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"2101611","DOI":"10.1002\/adom.202101611","article-title":"Suppressing the dark current in quantum dot infrared photodetectors by controlling carrier statistics","volume":"10","author":"Jung","year":"2022","journal-title":"Adv. Opt. Mater."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Blachowicz, T., and Ehrmann, A. (2020). Recent developments of solar cells from PbS colloidal quantum dots. Appl. Sci., 10.","DOI":"10.3390\/app10051743"},{"key":"ref_35","first-page":"23126","article-title":"Light enhanced moisture degradation of perovskite solar cell using first principles calculations","volume":"7","author":"Im","year":"2019","journal-title":"J. Mater. Chem. A"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2995","DOI":"10.1038\/s41467-024-47319-z","article-title":"Ligand-modified nanoparticle surfaces influence CO electroreduction selectivity","volume":"15","author":"Shirzadi","year":"2024","journal-title":"Nat. Commun."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"e01759","DOI":"10.1002\/lpor.202501759","article-title":"Advances in PbX (X = S, Se, Te) Quantum-Dot Photodetectors","volume":"20","author":"Li","year":"2026","journal-title":"Laser Photon. Rev."},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Kwon, J.B., Han, M., Jung, D.G., Kong, S.H., and Jung, D. (2021). High sensitivity shortwave infrared photodetector based on PbS QDs using P3HT. Nanomaterials, 11.","DOI":"10.3390\/nano11102683"},{"key":"ref_39","first-page":"44041","article-title":"Toward broadband imaging: Surface-engineered PbS quantum dot\/perovskite composite integrated ultrasensitive photodetectors","volume":"11","author":"Zhang","year":"2019","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"44451","DOI":"10.1021\/acsami.9b16539","article-title":"Long-wavelength lead sulfide quantum dots sensing up to 2600 nm for short-wavelength infrared photodetectors","volume":"11","author":"Dong","year":"2019","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"15414","DOI":"10.1021\/acsami.0c01744","article-title":"Inverted Si:PbS colloidal quantum dot heterojunction-based infrared photodetector","volume":"12","author":"Xu","year":"2020","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"113508","DOI":"10.1016\/j.sna.2022.113508","article-title":"High performance near-infrared photodetector based on PbS quantum dots and graphene","volume":"339","author":"Chen","year":"2022","journal-title":"Sens. Actuators A Phys."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"44164","DOI":"10.1021\/acsami.4c05201","article-title":"Synergic Surface Modifications of PbS Quantum Dots by Sodium Acetate in Solid-State Ligand Exchange toward Short-Wave Infrared Photodetectors","volume":"16","author":"Wang","year":"2024","journal-title":"ACS Appl. Mater. Interfaces"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/26\/11\/3391\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,5]],"date-time":"2026-06-05T03:26:49Z","timestamp":1780630009000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/26\/11\/3391"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,5,27]]},"references-count":43,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2026,6]]}},"alternative-id":["s26113391"],"URL":"https:\/\/doi.org\/10.3390\/s26113391","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,5,27]]}}}