Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 854, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155488
Keywords
Low-temperature; Electron transport layer; Titanium dioxide; Flexible perovskite solar cells; Sol-gel synthesis
Categories
Funding
- National Natural Science Foundation of China [11674258]
- 111 Project [B18038]
- Key projects of Natural Science Foundation of Hubei Province [2019CFA044]
- Applied Basic Research Program of Wuhan [2018010401011278]
- Science and Technology Innovation Program of Hubei Province [2018BKJ005]
- Natural Science Foundation of Hunan Province, China [2018JJ3527]
- Students Innovation and Entrepreneurship Training Program [20181049721003]
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The development of flexible perovskite solar cells faces the challenge of preparing the electron transport layer (ETL) at lower temperatures. A sol-gel method for the preparation of compact TiO2 ETL below 150 degrees C has been introduced, leading to improved photoelectric performance and stability of flexible PSCs.
Flexible perovskite solar cells (PSCs) have attracted much attention of the researchers due to their wide application. However, the great challenge in developing flexible PSCs is preparing the electron transport layer (ETL) at lower temperatures to meet with the processing requirements of plastic substrates. Herein, we introduce a facile sol-gel method for the preparation of the compact TiO2 (c-TiO2) ETL below 150 degrees C. By regulating the precursor solution concentration, annealing temperature and time of TiO2 ETL, we find that the c-TiO2 ETL exhibits the best photoelectric performance with the concentration of TiO2 precursor solution of 2 M, the annealing temperature of 150 degrees C and annealing time of 30 min, which exhibits the fastest electron extraction and lowest possibility of the charge carrier recombination. In final, a high power conversion efficiency of 16.11% is obtained with the planner structure of PEN/ITO/c-TiO2/MAPbI(3)/Spiro-OMeTAD/Au, which is the excellent one compared with the similar works, and the flexible PSCs also possess the good bending stability after 500 bending cycles. (C) 2020 Elsevier B.V. All rights reserved.
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