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the strong near-infrared (NIR) absorption and electronic confinement in PbS quantum dots (QDs), sub-bandgap photocurrent generation is possible, opening the way for solar cell efficiencies surpassing the classical limits. The present study shows an effective methodology for the inclusion of high densities of colloidal PbS QDs in a MAPbI3 (methylammonium lead iodide) perovskite matrix as a means to enhance the spectral window of photon absorption of the perovskite host film and allow photocurrent production below its bandgap. The QDs were introduced in the perovskite matrix in different sizes and concentrations to study the formation of quantum-confined levels within the host bandgap and the potential formation of a delocalized intermediate mini-band (IB). Pronounced sub-bandgap (in NIR) absorption was optically confirmed with the introduction of QDs in the perovskite. The consequent photocurrent generation was demonstrated via photoconductivity measurements, which indicated IB establishment in the films. Despite verifying the reduced crystallinity of the MAPbI3 matrix with a higher concentration and size of the embedded QDs, the nanostructured films showed pronounced enhancement (above 10-fold) in NIR absorption and consequent photocurrent generation at photon energies below the perovskite bandgap.<\/jats:p>","DOI":"10.3390\/nano13172447","type":"journal-article","created":{"date-parts":[[2023,8,29]],"date-time":"2023-08-29T10:47:26Z","timestamp":1693306046000},"page":"2447","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Sub-Bandgap Sensitization of Perovskite Semiconductors via Colloidal Quantum Dots Incorporation"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6335-4672","authenticated-orcid":false,"given":"G.","family":"Ribeiro","sequence":"first","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"},{"name":"INL, International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal"}]},{"given":"G.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"given":"U. D.","family":"Menda","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7533-9469","authenticated-orcid":false,"given":"M.","family":"Alexandre","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"given":"M. J.","family":"Brites","sequence":"additional","affiliation":[{"name":"LNEG, Estrada do Pa\u00e7o do Lumiar, 22, 1649-038 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0132-4969","authenticated-orcid":false,"given":"M. A.","family":"Barreiros","sequence":"additional","affiliation":[{"name":"LNEG, Estrada do Pa\u00e7o do Lumiar, 22, 1649-038 Lisboa, Portugal"}]},{"given":"S.","family":"Jana","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7350-649X","authenticated-orcid":false,"given":"H.","family":"\u00c1guas","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1997-7669","authenticated-orcid":false,"given":"R.","family":"Martins","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT, Department of Materials Science, NOVA School of Science and Technology and CEMOP\/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"given":"P. A.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"INL, International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal"},{"name":"CIETI, Departamento de F\u00edsica, Instituto Superior de Engenharia do Porto, Instituto Polit\u00e9cnico do Porto, 4249-015 Porto, Portugal"},{"name":"Departamento de F\u00edsica, Universidade de Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"given":"P.","family":"Salom\u00e9","sequence":"additional","affiliation":[{"name":"INL, International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal"},{"name":"i3N, Universidade de Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7374-0726","authenticated-orcid":false,"given":"M. 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