Universal passivation strategy to slot-die printed SnO2 for hysteresis-free efficient flexible perovskite solar module

Tongle Bu, Jing Li, Fei Zheng, Weijian Chen, Xiaoming Wen, Zhiliang Ku, Yong Peng, Jie Zhong (), Yi-Bing Cheng and Fuzhi Huang ()
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Tongle Bu: Wuhan University of Technology
Jing Li: Wuhan University of Technology
Fei Zheng: Swinburne University of Technology
Weijian Chen: Swinburne University of Technology
Xiaoming Wen: Swinburne University of Technology
Zhiliang Ku: Wuhan University of Technology
Yong Peng: Wuhan University of Technology
Jie Zhong: Wuhan University of Technology
Yi-Bing Cheng: Wuhan University of Technology
Fuzhi Huang: Wuhan University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Perovskite solar cells (PSCs) have reached an impressive efficiency over 23%. One of its promising characteristics is the low-cost solution printability, especially for flexible solar cells. However, printing large area uniform electron transport layers on rough and soft plastic substrates without hysteresis is still a great challenge. Herein, we demonstrate slot-die printed high quality tin oxide films for high efficiency flexible PSCs. The inherent hysteresis induced by the tin oxide layer is suppressed using a universal potassium interfacial passivation strategy regardless of fabricating methods. Results show that the potassium cations, not the anions, facilitate the growth of perovskite grains, passivate the interface, and contribute to the enhanced efficiency and stability. The small size flexible PSCs achieve a high efficiency of 17.18% and large size (5 × 6 cm2) flexible modules obtain an efficiency over 15%. This passivation strategy has shown great promise for pursuing high performance large area flexible PSCs.

Date: 2018
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DOI: 10.1038/s41467-018-07099-9

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