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Herein, we report a solution-processable conductive p-type PbS QD ink fabricated via solution-phase ligand exchange using 3-mercapto-1-propanol (MPOH), effectively overcoming the intrinsic limitations of SSLE. Introducing MPOH ligands results in a colloidally stable p-type QD ink that can be well-dispersed in polar solvents, enabling the formation of dense and smooth hole transport layers (HTLs) via a single coating step. QD films fabricated using the p-type ink exhibit substantially reduced surface roughness and trap density, resulting in a pronounced suppression of the dark current density in the photodetectors. Moreover, the damage-free integration of the p-type ink onto halide-passivated n-type PbS active layers is achieved by introducing an ultrathin MgO interlayer deposited using atomic layer deposition, which prevents solvent-induced interfacial degradation without compromising infrared transmission. Subsequently, a device architecture is developed by effectively increasing the HTL thickness using a p-type PbS ink, resulting in a significantly reduced dark current density and nearly 10-fold enhancement in the detectivity.<\/jats:p>","DOI":"10.1021\/acsami.6c05348","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T03:01:43Z","timestamp":1791255703000},"page":"55053-55061","source":"Crossref","is-referenced-by-count":0,"title":["Colloidally Stable P-Type Quantum Dot Ink with an Atomic Layer Deposition Interlayer for High-Detectivity Photodetectors"],"prefix":"10.1021","volume":"18","author":[{"given":"Hong Gu","family":"Kang","sequence":"first","affiliation":[{"name":"Hanyang University , , ,","place":[", Korea, Ansan 15588"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daekwon","family":"Shin","sequence":"additional","affiliation":[{"name":"Sungkyunkwan University (SKKU) , , ,","place":[", Korea, Suwon 16419"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seohee","family":"Park","sequence":"additional","affiliation":[{"name":"Sungkyunkwan University (SKKU) , , ,","place":[", Korea, Suwon 16419"]},{"name":"Korea Institute of Industrial Technology (KITECH) , , ,","place":["Ansan, Korea, 15588"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji Hyeon","family":"Woo","sequence":"additional","affiliation":[{"name":"Hanyang University , , ,","place":["Ansan, Korea, 15588"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min Seok","family":"Kim","sequence":"additional","affiliation":[{"name":"Hanyang University , , ,","place":["Ansan, Korea, 15588"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyeonjun","family":"Jeong","sequence":"additional","affiliation":[{"name":"Sungkyunkwan University (SKKU) , , ,","place":[", Korea, Suwon 16419"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7396-3690","authenticated-orcid":true,"given":"Hyekyoung","family":"Choi","sequence":"additional","affiliation":[{"name":"Korea Electrotechnology Research Institute , , , ,","place":["Changwon, Gyeongsangnam-do, Korea, 51543"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9863-1374","authenticated-orcid":true,"given":"Sohee","family":"Jeong","sequence":"additional","affiliation":[{"name":"Sungkyunkwan University (SKKU) , , ,","place":[", Korea, Suwon 16419"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jung Hoon","family":"Song","sequence":"additional","affiliation":[{"name":"Mokpo National University , , ,","place":["Muan, Korea, 58554"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5885-113X","authenticated-orcid":true,"given":"Ju Young","family":"Woo","sequence":"additional","affiliation":[{"name":"Hanyang University , , ,","place":[", Korea, Ansan 15588"]},{"name":"Korea Institute of Industrial Technology (KITECH) , , ,","place":["Ansan, Korea, 15588"]},{"name":"Chung-Ang University , , ,","place":["Seoul, Korea, 06974"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6948-171X","authenticated-orcid":true,"given":"Seong-Yong","family":"Cho","sequence":"additional","affiliation":[{"name":"Hanyang University , , ,","place":[", Korea, Ansan 15588"]},{"name":"Hanyang University , , ,","place":["Ansan, Korea, 15588"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,5]]},"reference":[{"issue":"6","key":"2026101406070997600_cit1","doi-asserted-by":"publisher","first-page":"2840","DOI":"10.1109\/TED.2021.3133191","article-title":"Infrared colloidal quantum dot image sensors","volume":"69","author":"Pejovi\u0107","year":"2021","journal-title":"IEEE Trans. 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