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

Byung Sung Kim; John Hong; Bo Hou; Yuljae Cho; Jung Inn Sohn; Seungnam Cha; Jong Min Kim

doi:10.1063/1.4960645

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

Byung Sung Kim, John Hong, Bo Hou, Yuljae Cho, Jung Inn Sohn, Seungnam Cha, Jong Min Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

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.

Original language	English
Article number	063901
Journal	Applied Physics Letters
Volume	109
Issue number	6
DOIs	https://doi.org/10.1063/1.4960645
State	Published - 8 Aug 2016

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title = "Inorganic-ligand exchanging time effect in PbS quantum dot solar cell",

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.",

author = "Kim, {Byung Sung} and John Hong and Bo Hou and Yuljae Cho and Sohn, {Jung Inn} and Seungnam Cha and Kim, {Jong Min}",

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AU - Kim, Byung Sung

AU - Hong, John

AU - Hou, Bo

AU - Cho, Yuljae

AU - Sohn, Jung Inn

AU - Cha, Seungnam

AU - Kim, Jong Min

PY - 2016/8/8

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N2 - 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.

AB - 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.

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

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