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High‐Efficiency PbS Quantum‐Dot Solar Cells with Greatly Simplified Fabrication Processing via “Solvent‐Curing”
Author(s) -
Lu Kunyuan,
Wang Yongjie,
Liu Zeke,
Han Lu,
Shi Guozheng,
Fang Honghua,
Chen Jun,
Ye Xingchen,
Chen Si,
Yang Fan,
Shulga Artem G.,
Wu Tian,
Gu Mengfan,
Zhou Sijie,
Fan Jian,
Loi Maria Antonietta,
Ma Wanli
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707572
Subject(s) - materials science , fabrication , quantum dot , energy conversion efficiency , photovoltaics , roll to roll processing , nanotechnology , solar cell , deposition (geology) , solvent , organic solar cell , optoelectronics , photovoltaic system , composite material , polymer , organic chemistry , chemistry , electrical engineering , medicine , paleontology , alternative medicine , engineering , pathology , sediment , biology
PbS quantum‐dot (QD) solar cells are promising candidates for low‐cost solution‐processed photovoltaics. However, the device fabrication usually requires ten more times film deposition and rinsing steps, which is not ideal for scalable manufacturing. Here, a greatly simplified deposition processing is demonstrated by replacing methanol with acetonitrile (ACN) as the rinsing solvent. It is discovered that ACN can effectively “cure” the film cracks generated from the volume loss during the solid‐state ligand‐exchange process, which enables the deposition of thick and dense films with much fewer deposition steps. Meanwhile, due to the aprotic nature of ACN, fewer trap states can be introduced during the rinsing process. As a result, with only three deposition steps for the active layer, a CPVT‐certified 11.21% power conversion efficiency is obtained, which is the highest efficiency ever reported for PbS QD solar cells employing a solid‐state ligand‐exchange process. More importantly, the simple film‐deposition processing provides an opportunity for the future application of QDs in low‐cost printing of optoelectronic devices.