Super Flexible Transparent Conducting Oxide-Free Organic-Inorganic Hybrid Perovskite Solar Cells with 19.01% Efficiency (Active Area = 1 cm(2))
- Authors
- Heo, Jin Hyuck; Lee, David Sunghwan; Zhang, Fei; Xiao, Chuanxiao; Heo, Su Jeong; Lee, Hyong Joon; Zhu, Kai; Im, Sang Hyuk
- Issue Date
- 12월-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Li-TFSI-doped graphene electrodes; TCO-free solar cells; p-i-n structure; perovskite solar cells; super flexible solar cells
- Citation
- SOLAR RRL, v.5, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLAR RRL
- Volume
- 5
- Number
- 12
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135599
- DOI
- 10.1002/solr.202100733
- ISSN
- 2367-198X
- Abstract
- Highly efficient organic-inorganic hybrid perovskite solar cells (OIHP-SCs) are often fabricated on a transparent conducting oxide (TCO) substrate such as indium tin oxide (ITO). However, the presence of TCOs is disadvantageous to the development of flexible OIHP-SCs due to the brittle nature of ITO which is easily breakable during bending. Herein, a flexible TCO-free OIHP-SC is demonstrated by using lithium bis(trifluoromethane)sulfonimide (Li-TFSI) as a codopant for the single-layer graphene transparent conducting electrode and poly(triarylamine) hole-transporting material (HTM) on a flexible polydimethylsiloxane substrate. The optical and electrical properties of the Li-TFSI-doped graphene substrate are measured by controlling the doping amount and the best conditions for charge extraction are established at a doping concentration of 20 mm Li-TFSI, thus optimizing the device photovoltaic performance. As a result, a highest power conversion efficiency of 19.01% is demonstrated by the flexible TCO-free OIHP-SC devices with an active area of 1 cm(2). In addition, the flexible TCO-free OIHP-SCs exhibit good bending stability after 5000 bending cycles at radii of 6, 4, and 2 mm and excellent light soaking stability under 1 Sun light intensity over 1000 h as opposed to the poor stability when using poly(3,4-ethylenedioxythiophene) polystyrene sulfonate as the HTM.
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