Photoactive Melt‐Grown Group VI Transition Metal Dichalcogenides

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Abstract
Growth of two‐dimensional patches of photosensitive layered transition metal dichalcogenides ( , , ) from tellurium melts is reported. The material exhibits a substantially different morphology compared to vapor‐transported crystals. Single‐crystalline hexagons grow together along their edges and can form larger polycrystalline films with relatively few surface defects. No rosette‐type growth is observed. The first electrochemical solar cells made with these materials did not yield conversion efficiencies exceeding 1%. Scanning laser spot analysis on smooth crystals reveals deficiencies concerning doping profile, stoichiometry, and impurity content. Better control of the growth process promises the development of high quality thin films.

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