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

ByungSung Kim | Zendy; John Hong | Zendy; Bo Hou | Zendy; Yuljae Cho | Zendy; Jung Inn Sohn | Zendy; SeungNam Cha | Zendy; Jong Min Kim | Zendy

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

Author(s) -

ByungSung Kim,

John Hong,

Bo Hou,

Yuljae Cho,

Jung Inn Sohn,

SeungNam Cha,

Jong Min Kim

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4960645

Subject(s) - lead sulfide , quantum dot , nanocrystal , passivation , solar cell , photoluminescence , materials science , nucleation , iodide , photovoltaic system , dissociation (chemistry) , nanotechnology , chemical engineering , optoelectronics , inorganic chemistry , chemistry , ecology , organic chemistry , layer (electronics) , engineering , biology

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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