Open AccessVapor phase fabrication of three‐dimensional arrayed BiI 3 nanosheets for cost‐effective solar cells
Author(s) -
Zhu Yiyi,
Zhang Qianpeng,
Kam Matthew,
Poddar Swapnadeep,
Gu Leilei,
Liang Shijun,
Qi Pengfei,
Miao Feng,
Fan Zhiyong
Publication year - 2020
Publication title -
infomat
Language(s) - English
Resource type - Journals
ISSN - 2567-3165
DOI - 10.1002/inf2.12070
Subject(s) - monocrystalline silicon , materials science , optoelectronics , energy conversion efficiency , heterojunction , crystallite , fabrication , photovoltaic system , solar cell , absorption (acoustics) , nanotechnology , silicon , composite material , electrical engineering , engineering , medicine , alternative medicine , pathology , metallurgy
Multilayered photovoltaic absorbers have triggered widespread attention for their unique structure and properties. However, multilayered materials in the randomly oriented polycrystalline thin‐film lead to ineffective carrier transport and collection, which hinders the process of achieving high‐performance solar cells. Herein, this issue is tackled by producing the three‐dimensional (3D) heterojunction BiI 3 nanosheets (NSs) solar cells, which embed vertically aligned monocrystalline BiI 3 NSs into spiro‐OMeTAD. The preferred orientation of BiI 3 NSs and large p‐n junction areas of 3D heterojunction structure enable a strong light absorption and effective carrier transport and collection, and thus a power conversion efficiency (PCE) of 1.45% was achieved. Moreover, this PCE is the highest ever reported for BiI 3 based solar cells to our best knowledge. Moreover, the nonencapsulated device remained 96% of the initial PCE after 24 h continuous one sun illumination at ~70% humidity condition, and 82% of the initial PCE after 1‐month storage at ~30% humidity condition.