Abstract
AbstractMultilayered 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 BiI3 nanosheets (NSs) solar cells, which embed vertically aligned monocrystalline BiI3 NSs into spiro‐OMeTAD. The preferred orientation of BiI3 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 BiI3 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.image
Highlights
Solar energy is one of the most abundant sustainable energy resources in the world
For the valence band maximum (VBM) and conduction band minimum (CBM) that are parallel to the I-Bi-I plane,[4,10] carriers are mobile within planes but immobile across planes
The results show that the temperature variation (90 C-110 C) and reaction time (1-3 h) do not have a great impact on the BiI3 NSs grain size, the related discussion can be found in Figures S4 and S5
Summary
This version is available at HKUST SPD - Institutional Repository (https://repository.ust.hk). If it is the author's pre-published version, changes introduced as a result of publishing processes such as copy-editing and formatting may not be reflected in this document. For a definitive version of this work, please refer to the published version
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