Journal
ADVANCED MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202308692
Keywords
crystallization kinetics; fully textured; hybrid sequential deposition method; perovskite/silicon tandem solar cells; wide-bandgap
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A diffusible perovskite capping layer strategy is proposed to solve the issue of uneven crystallization in thermal evaporation and spin-coating hybrid sequential deposited perovskite, which is currently the most promising method to achieve high efficiency in commercially textured perovskite/silicon tandem solar cells.
Nowadays, the development of wide-bandgap perovskite by thermal evaporation and spin-coating hybrid sequential deposition (HSD) method has special meaning on textured perovskite/silicon tandem solar cells. However, the common issues of insufficient reaction caused by blocking of perovskite capping layer are exacerbated in HSD, because evaporated precursors are usually denser with higher crystallinity and the widely used additive-assisted microstructure is also difficult to access. Here, a facile diffusible perovskite capping layer (DPCL) strategy to solve this dilemma is presented. With DPCL, crystallization alleviation of perovskite and more diffusion channels of organic salts can be realized simultaneously, contributing to a homogenization process. The resultant perovskite films exhibit complete conversion, uniform crystallization, enhanced quality, and reduced defect, leading to obvious improvements in device efficiency, repeatability, and stability. This work offers a way to promote the development of textured tandems a step further. In this work, diffusible perovskite capping layer strategy is proposed to solve the dilemma of uneven crystallization faced by thermal evaporation and spin-coating hybrid sequential deposited perovskite, which is by far the most promising way to obtain high efficiency of commercially textured perovskite/silicon tandem solar cells.image
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