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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems (LEHMS)
Research Interests
  • Solar energy conversion, perovskite solar cells, inorganic-organic hybrid materials and processing, solution chemistry

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Stabilization of Precursor Solution and Perovskite Layer by Addition of Sulfur

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Title
Stabilization of Precursor Solution and Perovskite Layer by Addition of Sulfur
Author
Min, HanulKim, GwisuPaik, Min JaeLee, SeungwoonYang, Woon SeokUng, MinsuSeok, Sang Il
Issue Date
2019-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.9, no.17, pp.1803476
Abstract
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/26876
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201803476
DOI
10.1002/aenm.201803476
ISSN
1614-6832
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