This work presents a low‐temperature vapor transport deposition method to synthesize Se thin films, enabling a precise control over thickness and crystallographic texture. Using a combinatorial synthesis approach, the authors demonstrate a direct correlation between annealing temperature and preferred crystalline orientation, which significantly influences device performance. Films with a strong vertical alignment exhibit reduced Urbach energy and subgap absorption, as well as enhanced optoelectronic properties, resulting in power conversion efficiencies exceeding 4% under AM1.5 G, and up to 10% under indoor illumination, with an excellent fill factor stability and reduced recombination losses. This study highlights the critical role of texture control in determining the optoelectronic quality of anisotropic chalcogenide solar cells and provides an effective strategy for tuning the morphology, crystalline orientation, and optical characteristics of Se thin films.
Caño et al. (Thu,) studied this question.
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