Journal
ADVANCED MATERIALS
Volume 32, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001906
Keywords
CsPbI3; guanidinium thiocyanate; ligand exchange; perovskite quantum dots; solar cells
Categories
Funding
- National Key Research and Development (R& D) Program of China [2016YFA0202402, 2017YFA0205002]
- National Natural Science Foundation of China [51761145013, 61911530158, 51803144, 61674111]
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- 111 projects
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Soochow University-Western University Center for Synchrotron Radiation Research
- China Scholarship Council (CSC)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- Office of Science, Office of Basic Energy Sciences within the U.S. Department of Energy
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Metal halide perovskite quantum dots (Pe-QDs) are of great interest in new-generation photovoltaics (PVs). However, it remains challenging in the construction of conductive and intact Pe-QD films to maximize their functionality. Herein, a ligand-assisted surface matrix strategy to engineer the surface and packing states of Pe-QD solids is demonstrated by a mild thermal annealing treatment after ligand exchange processing (referred to as LE-TA) triggered by guanidinium thiocyanate. The LE-TA method induces the formation of surface matrix on CsPbI3 QDs, which is dominated by the cationic guanidinium (GA(+)) rather than the SCN-, maintaining the intact cubic structure and facilitating interparticle electrical interaction of QD solids. Consequently, the GA-matrix-confined CsPbI3 QDs exhibit remarkably enhanced charge mobility and carrier diffusion length compared to control ones, leading to a champion power conversion efficiency of 15.21% when assembled in PVs, which is one of the highest among all Pe-QD solar cells. Additionally, the LE-TA method shows similar effects when applied to other Pe-QD PV systems like CsPbBr3 and FAPbI(3) (FA = formamidinium), indicating its versatility in regulating the surfaces of various Pe-QDs. This work may afford new guidelines to construct electrically conductive and structurally intact Pe-QD solids for efficient optoelectronic devices.
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