期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803476
关键词
perovskite solar cells; precursor solutions; stabilization; sulfur
类别
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2015M1A2A2056542, 2018R1A3B1052820, 2012M3A6A7054861]
- UNIST [1.190028.01]
- National Research Foundation of Korea [2015M1A2A2056542, 2018R1A3B1052820, 2019미래선도형 특성화연구, 2012M3A6A7054861] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Efficient perovskite solar cells (PSCs) are mainly fabricated by a solution coating processes. However, the efficiency of such devices varies significantly with the aging time of the precursor solution used to fabricate them, which includes a mixture of perovskite components, especially methylammonium (MA), and formamidinium (FA) cations. Herein, how the inorganic-organic hybrid perovskite precursor solution of (FAPbI(3))(0.95)(MAPbBr(3))(0.05) degrades over time and how such degradation can be effectively inhibited is reported on, and the associated mechanism of degradation is discussed. Such degradation of the precursor solution is closely related to the loss of MA cations dissolved in the FA solution through the deprotonation of MA to volatile methylamine (CH3NH2). Addition of elemental sulfur (S-8) drastically stabilizes the precursor solution owing to amine-sulfur coordination, without compromising the power conversion efficiency (PCE) of the derived PSCs. Furthermore, sulfur introduced to stabilize the precursor solution results in improved PSC stability.
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