Cesium Titanium(IV) Bromide Thin Films Based Stable Lead-free Perovskite Solar Cells
2018; Elsevier BV; Volume: 2; Issue: 3 Linguagem: Inglês
10.1016/j.joule.2018.01.009
ISSN2542-4785
AutoresMin Chen, Ming‐Gang Ju, Alexander D. Carl, Yingxia Zong, Ronald L. Grimm, Jiajun Gu, Xiao Cheng Zeng, Yuanyuan Zhou, Nitin P. Padture,
Tópico(s)Chalcogenide Semiconductor Thin Films
ResumoSignificant effort is being devoted to the search for all-inorganic Pb-free halide perovskites (HPs) for photovoltaic applications. However, candidate HPs that combine all the desirable attributes — ease of synthesis, favorable bandgaps, outstanding optoelectronic properties, high stability, no toxicity — are extremely rare. Here, we demonstrate experimentally the promise of cesium titanium(IV) bromide (Cs2TiBr6), a part of the Ti-based vacancy-ordered double-perovskite halides family, in perovskite solar cells (PSCs). We show, for the first time, that high-quality Cs2TiBr6 thin films can be prepared through a facile low-temperature vapor-based method. These films exhibit a favorable bandgap of ∼1.8 eV, long and balanced carrier-diffusion lengths exceeding 100 nm, suitable energy levels, and superior intrinsic and environmental stability. The first demonstration of Cs2TiBr6 thin films-based PSCs shows stable efficiency of up to 3.3%. Insights into the Cs2TiBr6 film-formation mechanisms and the PSC device operation are provided, pointing to directions for improving Ti-based PSCs.
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