Microhole Structure in Flexible Semitransparent Perovskite Solar Cells Using Nickel Mesh as the Framework and Electrode

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Abstract

Semitransparent perovskite solar cells can provide auxiliary power in applications such as power-generating windows and smart car windows. However, in conventional planar-structured devices, both the power conversion efficiency (PCE) and the average visible light transmittance (AVT) of the devices are restricted by the band gap or thickness of the perovskite absorption layer, which hinders the development and application of semitransparent perovskite solar cells. In this work, we construct a new type of semitransparent perovskite solar cell with a three-dimensional (3D) mesh structure using nickel mesh as a framework and bottom electrode. The AVT of the device is controlled by a nickel mesh. When narrow band gap perovskite materials were deposited, the PCE of the device was 4.48%, the average visible light transmittance was 16.5%, the color rendering index was 98.35, and the bifacial coefficient reached 79%. Additionally, due to the flexible nature of the nickel mesh, the device exhibited excellent mechanical stability, maintaining 90% of its initial PCE after 1000 bending cycles at R = 10 mm. This three-dimensional mesh structure provides a new idea for realizing the transmittance of semitransparent flexible perovskite solar cells with high efficiency and high transmittance. It is expected to promote their wide application in fields such as building-integrated photovoltaics.

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