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Record-efficiency flexible perovskite solar cell and module enabled by a porous-planar structure as an electron transport layer

Author(s)
Chung, JaehoonShin, Seong SikHwang, KyeongilKim, GeunjinKim, Ki WoongLee, Da SeulKim, WansunMa, Boo SooKim, Young-KiKim, Taek-SooSeo, Jangwon
Issued Date
2020-12
DOI
10.1039/d0ee02164d
URI
https://scholarworks.unist.ac.kr/handle/201301/53072
Fulltext
https://pubs.rsc.org/en/content/articlelanding/2020/EE/D0EE02164D#!divAbstract
Citation
Energy and Environmental Sciences, v.13, no.12, pp.4854 - 4861
Abstract
A facile and low-temperature process to prepare planar perovskite solar cells (PSCs) has led to considerable progress in flexible solar cells toward high throughput production based on a roll-to-roll process. However, the performance of planar PSCs is still lower than that of mesoscopic PSCs using a high temperature process. Here, we report a new concept of a low temperature processed porous planar electron transport layer (ETL) inspired by a mesoporous structure for improving the performance of flexible devices. The structurally and energetically designed porous planar ETL induced the formation of a high quality perovskite and a preferred band alignment, resulting in improved charge collection efficiency in a fabricated device. Through the porous planar ETL, we achieved a power conversion efficiency (PCE) of 20.7% with a certified efficiency of 19.9% on a flexible substrate, which is the highest PCE reported to date. In addition, for the first time, we succeed in fabricating a large area flexible module with the porous planar ETL, demonstrating a PCE of 15.5%, 12.9% and 11.8% on an aperture area of 100 cm(2), 225 cm(2) and 400 cm(2), respectively. We believe that this strategy will pave a new way for realizing highly efficient flexible PSCs.
Publisher
Royal Society of Chemistry
ISSN
1754-5692
Keyword
PERFORMANCEOXIDETINSNO2

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