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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Formate as Anti-Oxidation Additives for Pb-Free FASnI(3) Perovskite Solar Cells

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Title
Formate as Anti-Oxidation Additives for Pb-Free FASnI(3) Perovskite Solar Cells
Author
Jang, HyungsuLim, Hyeong YongYoon, Yung JinSeo, JongdeukPark, Chan BeomSon, Jung GeonKim, Jae WonShin, Yun SeopAn, Na GyeongChoi, Seung JuKim, Su HwanJeong, JaekiJo, YimhyunKwak, Sang KyuKim, Dong SukKim, Jin Young
Issue Date
2022-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
SOLAR RRL, pp.2200789
Abstract
Pb-free Sn-based perovskite solar cells (PSCs) have significant potential for application in photovoltaic devices because oftheir suitable bandgap, low exciton binding energy, high carrier mobility, and long diffusion length. However, their performance is hampered by several issues. Sn-based perovskites are highly susceptible to oxidation, which induces a high concentration of defects and degrades the chemical stability of the perovskite crystals. Herein, the anion formate (HCOO-) can effectively suppress the oxidation of Sn in the pure formamidinium tin triiodide (FASnI(3)) perovskite without using A-site cationic additives. Moreover, the presence of formate results in a uniform pinhole-free perovskite film with a low trap density, reduced charge carrier recombination, and improved charge extraction. Density functional theory calculations show that formate-treated FASnI(3) has improved stability against oxidative Sn degradation. The formate-treated PSC achieves a power conversion efficiency of 12.11% at a high open-circuit voltage of 0.71 V. The device exhibits improved stability in ambient air in which it maintained over 80% of its initial power conversion efficiency after 180 min because oxidation is inhibited owing to the strong interaction between Sn and formate.
URI
https://scholarworks.unist.ac.kr/handle/201301/60014
DOI
10.1002/solr.202200789
ISSN
2367-198X
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