Design optimization of bifacial perovskite minimodules for improved efficiency and stability

Hangyu Gu, Chengbin Fei, Guang Yang, Bo Chen, Md Aslam Uddin, Hengkai Zhang, Zhenyi Ni, Haoyang Jiao, Wenzhan Xu, Zijie Yan and Jinsong Huang ()
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Hangyu Gu: University of North Carolina at Chapel Hill
Chengbin Fei: University of North Carolina at Chapel Hill
Guang Yang: University of North Carolina at Chapel Hill
Bo Chen: University of North Carolina at Chapel Hill
Md Aslam Uddin: University of North Carolina at Chapel Hill
Hengkai Zhang: University of North Carolina at Chapel Hill
Zhenyi Ni: University of North Carolina at Chapel Hill
Haoyang Jiao: University of North Carolina at Chapel Hill
Wenzhan Xu: University of North Carolina at Chapel Hill
Zijie Yan: University of North Carolina at Chapel Hill
Jinsong Huang: University of North Carolina at Chapel Hill

Nature Energy, 2023, vol. 8, issue 7, 675-684

Abstract: Abstract The efficiency and stability of bifacial perovskite solar modules are still relatively low. Here we report bifacial minimodules with front efficiency comparable to opaque monofacial counterparts, while gaining additional energy from albedo light. We add a hydrophobic additive to the hole transport layer to protect the perovskite films from moisture. We integrate silica nanoparticles with proper size and spacing in perovskite films to recover the absorption loss induced by the absence of reflective metal electrodes. The small-area single-junction bifacial perovskite cells have a power-generation density of 26.4 mW cm−2 under 1 sun illumination and an albedo of 0.2. The bifacial minimodules show front efficiency of over 20% and bifaciality of 74.3% and thus a power-generation density of over 23 mW cm−2 at an albedo of 0.2. The bifacial minimodule retains 97% of its initial efficiency after light soaking under 1 sun for over 6,000 hours at 60 ± 5 °C.

Date: 2023
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DOI: 10.1038/s41560-023-01254-3

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