The effect of water on colloidal quantum dot solar cells

Guozheng Shi, Haibin Wang, Yaohong Zhang, Chen Cheng, Tianshu Zhai, Botong Chen, Xinyi Liu, Ryota Jono, Xinnan Mao, Yang Liu, Xuliang Zhang, Xufeng Ling, Yannan Zhang, Xing Meng, Yifan Chen, Steffen Duhm, Liang Zhang, Tao Li, Lu Wang, Shiyun Xiong, Takashi Sagawa, Takaya Kubo, Hiroshi Segawa, Qing Shen, Zeke Liu () and Wanli Ma ()
Additional contact information
Guozheng Shi: Soochow University
Haibin Wang: The University of Tokyo
Yaohong Zhang: The University of Electro-Communications
Chen Cheng: Soochow University
Tianshu Zhai: Soochow University
Botong Chen: Soochow University
Xinyi Liu: Northern Illinois University
Ryota Jono: The University of Tokyo
Xinnan Mao: Soochow University
Yang Liu: Soochow University
Xuliang Zhang: Soochow University
Xufeng Ling: Soochow University
Yannan Zhang: Soochow University
Xing Meng: Soochow University
Yifan Chen: Soochow University
Steffen Duhm: Soochow University
Liang Zhang: Soochow University
Tao Li: Northern Illinois University
Lu Wang: Soochow University
Shiyun Xiong: Soochow University
Takashi Sagawa: Kyoto University
Takaya Kubo: The University of Tokyo
Hiroshi Segawa: The University of Tokyo
Qing Shen: The University of Electro-Communications
Zeke Liu: Soochow University
Wanli Ma: Soochow University

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Almost all surfaces sensitive to the ambient environment are covered by water, whereas the impacts of water on surface-dominated colloidal quantum dot (CQD) semiconductor electronics have rarely been explored. Here, strongly hydrogen-bonded water on hydroxylated lead sulfide (PbS) CQD is identified. The water could pilot the thermally induced evolution of surface chemical environment, which significantly influences the nanostructures, carrier dynamics, and trap behaviors in CQD solar cells. The aggravation of surface hydroxylation and water adsorption triggers epitaxial CQD fusion during device fabrication under humid ambient, giving rise to the inter-band traps and deficiency in solar cells. To address this problem, meniscus-guided-coating technique is introduced to achieve dense-packed CQD solids and extrude ambient water, improving device performance and thermal stability. Our works not only elucidate the water involved PbS CQD surface chemistry, but may also achieve a comprehensive understanding of the impact of ambient water on CQD based electronics.

Date: 2021
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DOI: 10.1038/s41467-021-24614-7

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