Harnessing strong aromatic conjugation in low-dimensional perovskite heterojunctions for high-performance photovoltaic devices

Bo Li, Qi Liu, Jianqiu Gong, Shuai Li, Chunlei Zhang, Danpeng Gao, Zhongwei Chen, Zhen Li, Xin Wu, Dan Zhao, Zexin Yu, Xintong Li, Yan Wang, Haipeng Lu (), Xiao Cheng Zeng () and Zonglong Zhu ()
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Bo Li: City University of Hong Kong
Qi Liu: City University of Hong Kong
Jianqiu Gong: City University of Hong Kong
Shuai Li: City University of Hong Kong
Chunlei Zhang: City University of Hong Kong
Danpeng Gao: City University of Hong Kong
Zhongwei Chen: The Hong Kong University of Science and Technology, Clear Water Bay
Zhen Li: City University of Hong Kong
Xin Wu: City University of Hong Kong
Dan Zhao: City University of Hong Kong
Zexin Yu: City University of Hong Kong
Xintong Li: City University of Hong Kong
Yan Wang: City University of Hong Kong
Haipeng Lu: The Hong Kong University of Science and Technology, Clear Water Bay
Xiao Cheng Zeng: City University of Hong Kong
Zonglong Zhu: City University of Hong Kong

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Low-dimensional/three-dimensional perovskite heterojunctions have shown great potential for improving the performance of perovskite photovoltaics, but large organic cations in low-dimensional perovskites hinder charge transport and cause carrier mobility anisotropy at the heterojunction interface. Here, we report a low-dimensional/three-dimensional perovskite heterojunction that introduces strong aromatic conjugated low-dimensional perovskites in p-i-n devices to reduce the electron transport resistance crossing the perovskite/electron extraction interface. The strong aromatic conjugated π-conjugated network results in continuous energy orbits among [Pb2I6]2− frameworks, thereby effectively suppressing interfacial non-radiative recombination and boosting carrier extraction. Consequently, the devices achieved an improved efficiency to 25.66% (certified 25.20%), and maintained over 95% of the initial efficiency after 1200 hours and 1000 hours under ISOS-L-1I and ISOS-D-1 protocols, respectively. The chemical design of strong aromatic conjugated molecules in perovskite heterojunctions provides a promising avenue for developing efficient and stable perovskite photovoltaics.

Date: 2024
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DOI: 10.1038/s41467-024-47112-y

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