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High Performance PbS Colloidal Quantum Dot Solar Cells by Employing Solution‐Processed CdS Thin Films from a Single‐Source Precursor as the Electron Transport Layer
Author(s) -
Hu Long,
Patterson Robert J.,
Hu Yicong,
Chen Weijian,
Zhang Zhilong,
Yuan Lin,
Chen Zihan,
Conibeer Gavin J.,
Wang Gang,
Huang Shujuan
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201703687
Subject(s) - materials science , chemical bath deposition , quantum dot , thin film , sputter deposition , heterojunction , optoelectronics , nanotechnology , energy conversion efficiency , annealing (glass) , solar cell , quantum dot solar cell , solution process , sputtering , fabrication , polymer solar cell , composite material , medicine , alternative medicine , pathology
CdS thin films are a promising electron transport layer in PbS colloidal quantum dot (CQD) photovoltaic devices. Some traditional deposition techniques, such as chemical bath deposition and RF (radio frequency) magnetron sputtering, have been employed to fabricate CdS films and CdS/PbS CQD heterojunction photovoltaic devices. However, their power conversion efficiencies (PCEs) are moderate compared with ZnO/PbS and TiO 2 /PbS heterojunction CQD solar cells. Here, efficiencies have been improved substantially by employing solution‐processed CdS thin films from a single‐source precursor. The CdS film is deposited by a straightforward spin‐coating and annealing process, which is a simple, low‐cost, and high‐material‐usage fabrication process compared to chemical bath deposition and RF magnetron sputtering. The best CdS/PbS CQD heterojunction solar cell is fabricated using an optimized deposition and air‐annealing process achieved over 8% PCE, demonstrating the great potential of CdS thin films fabricated by the single‐source precursor for PbS CQDs solar cells.