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Inorganic-ligand exchanging time effect in PbS quantum dot solar cell

Kim, Byung-Sung, Hong, John, Hou, Bo, Cho, Yuljae, Sohn, Jung Inn, Cha, SeungNam and Kim, Jong Min 2016. Inorganic-ligand exchanging time effect in PbS quantum dot solar cell. Applied Physics Letters 109 (6) , -. 10.1063/1.4960645

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Abstract

We investigate time-dependent inorganic ligand exchanging effect and photovoltaic performance of lead sulfide (PbS) nanocrystal films. With optimal processing time, volume shrinkage induced by residual oleic acid of the PbS colloidal quantum dot (CQD) was minimized and a crack-free film was obtained with improved flatness. Furthermore, sufficient surface passivation significantly increased the packing density by replacing from long oleic acid to a short iodide molecule. It thus facilities exciton dissociation via enhanced charge carrier transport in PbS CQD films, resulting in the improved power conversion efficiency from 3.39% to 6.62%. We also found that excess iodine ions on the PbS surface rather hinder high photovoltaic performance of the CQD solar cell.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: AIP Publishing
ISSN: 0003-6951
Date of First Compliant Deposit: 25 February 2020
Date of Acceptance: 28 July 2016
Last Modified: 25 Feb 2020 11:34
URI: http://orca.cf.ac.uk/id/eprint/129522

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