Issue 12, 2020

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

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 cm2, 225 cm2 and 400 cm2, respectively. We believe that this strategy will pave a new way for realizing highly efficient flexible PSCs.

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

Supplementary files

Article information

Article type
Communication
Submitted
08 Jul 2020
Accepted
22 Oct 2020
First published
22 Oct 2020

Energy Environ. Sci., 2020,13, 4854-4861

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

J. Chung, S. S. Shin, K. Hwang, G. Kim, K. W. Kim, D. S. Lee, W. Kim, B. S. Ma, Y. Kim, T. Kim and J. Seo, Energy Environ. Sci., 2020, 13, 4854 DOI: 10.1039/D0EE02164D

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