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Vol. 14 (2022)

Fully Roll-to-Roll Processed Efficient Perovskite Solar Cells via Precise Control on the Morphology of PbI2:CsI Layer

https://doi.org/10.1007/s40820-022-00815-7
Hengyue Li
Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, People’s Republic of China
Chuantian Zuo
Flexible Electronics Laboratory, CSIRO Manufacturing, Clayton, VIC 3168, Australia
Dechan Angmo
Flexible Electronics Laboratory, CSIRO Manufacturing, Clayton, VIC 3168, Australia
Hasitha Weerasinghe
Flexible Electronics Laboratory, CSIRO Manufacturing, Clayton, VIC 3168, Australia
Mei Gao
Flexible Electronics Laboratory, CSIRO Manufacturing, Clayton, VIC 3168, Australia
Junliang Yang
Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, People’s Republic of China

Corresponding Author: Junliang Yang

junliang.yang@csu.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 79

Abstract

Perovskite solar cells (PSCs) have attracted tremendous attention as a promising alternative candidate for clean energy generation. Many attempts have been made with various deposition techniques to scale-up manufacturing. Slot-die coating is a robust and facile deposition technique that can be applied in large-area roll-to-roll (R2R) fabrication of thin film solar cells with the advantages of high material utilization, low cost and high throughput. Herein, we demonstrate the encouraging result of PSCs prepared by slot-die coating under ambient environment using a two-step sequential process whereby PbI2:CsI is slot-die coated first followed by a subsequent slot-die coating of organic cations containing solution. A porous PbI2:CsI film can promote the rapid and complete transformation into perovskite film. The crystallinity and morphology of perovskite films are significantly improved by optimizing nitrogen blowing and controlling substrate temperature. A power conversion efficiency (PCE) of 18.13% is achieved, which is promising for PSCs fabricated by two-step fully slot-die-coated devices. Furthermore, PSCs with a 1 cm2 area yield a champion PCE of 15.10%. Moreover, a PCE of 13.00% is obtained on a flexible substrate by the roll-to-roll (R2R) coating, which is one of the highest reported cells with all layers except for metal electrode fabricated by R2R process under ambient condition.


Highlights:


1 The slot-die-coated porous PbI2:CsI film assisted with nitrogen blowing can promote the rapid and complete transformation of perovskite film.
2 The crystallinity and morphology of slot-die-coated perovskite film are significantly improved by controlling substrate temperature.
3 Fully slot-die-coated perovskite solar cells achieve a power conversion efficiency (PCE) of 18.13%, and fully roll-to-roll printed flexible PSCs achieve a PCE of 13.00% in ambient condition.

Keywords

Perovskite solar cells Slot-die coating Roll-to-roll Ambient condition Flexible
Li, Hengyue, Chuantian Zuo, Dechan Angmo, Hasitha Weerasinghe, Mei Gao, and Junliang Yang. 2022. “Fully Roll-to-Roll Processed Efficient Perovskite Solar Cells via Precise Control on the Morphology of PbI2:CsI Layer”. Nano-Micro Letters 14 (March):79. https://doi.org/10.1007/s40820-022-00815-7.
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