Research Projects

The focus of this experimental-approach based proposal is the design and development of “robust” 2D layered Aurivillius halides for environmentally stable photovoltaic devices. Presently known 3 dimensional hybrid perovskite compositions are known for very high power conversion efficiency but suffer from very poor stability. Genesis of this proposal is based on the hypothesis that Aurivillius type layered perovskites halide with A’2X2 (A’ is alkaline earth ion) intersecting layers separating the perovskite sheets in (001) orientation, could lead to more moisture tolerable surfaces. The weaker bonding across the intercalated heavy cation layers arrest the ion migration mechanisms which leads to enhanced stability. Success of the hypothesis would result in establishment of novel Aurivillius type halide compositions that are robust absorber materials suitable for photovoltaics. In the backdrop of existing theoretical/computational work on 2D Aurivillius halide compositions, the project will involve design, synthesis and comprehensive structural/optoelectronic characterization of 2D Aurivillius halide phases. The compositions studied in this work will be tuned as a function of number of perovskite layers (n), halogen ion type (X) and interlayer heavy spacer cations. Execution of this proposal will lead to establishment of large catalogue of halide compositions and a better understanding on correlation of structure with their optoelectronic properties. The compositions to be developed and studied in this project will be available as sustainable options for scientific community engaged in photovoltaics research.