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  1. Cathodoluminescence Hyperspectral Imaging to map nanoscale heterogeneity in Halide Perovskites

         ACS Applied Energy Materials

          Lethy et al

 The nanoscale morphology of solar cell materials strongly affects their performance. We report direct evidence for the existence of multiple length scales of heterogeneity in halide perovskites such as CsPbBr3 and CsPbBr3:KI. Contrary to the general notion of two distinct phases, our study suggests the presence of multiple phases in mixed halide perovskites. Highly spatially resolved (≈50 nm) cathodoluminescence maps reveal that the length scale of heterogeneity is composition dependent: smaller (≈ 200 nm) for CsPbBr3, and larger (≈500–1000 nm) for CsPbBr3:KI.

2.  Why do we need wide-bandgap semiconductors for indoor photovoltaics?

Frontiers in Chemistry

Lethy Krishnan Jagadamma and Shaoyang Wang

Among the various existing photovoltaic technologies such as silicon, CdTe, CIGS, organic photovoltaics (OPVs) and halide perovskites, the latter is identified as the most promising for indoor light harvesting. This suitability is mainly due to its composition engineering adaptability to tune the bandgap to match the indoor light spectrum. Here, in this review, we are summarizing the state-of-the-art research efforts on halide perovskite-based indoor photovoltaics, the effect of composition tuning and the selection of various functional layer and device architecture onto their power conversion efficiency.



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