s.rondiya@imperial.ac.uk

Photovoltaics


Materials – Perovskites, Cu-based ternary and quaternary semiconductors
(a) Band alignment and Band offset - I am working on different strategies to dramatically increase the efficiency and lower the cost of solar energy. The different physical and chemical properties of interfacial layers often cause unfavorable band alignment and interfacial states that leads to high carrier recombination and eventually results in lower device efficiency. Under this research theme, my goal is to employ experimental methods to engineer the optical and structural properties of semiconducting materials, to reduce recombination due to interface trap states. Carrier management through interface engineering via emerging materials will help to achieve ultra-high efficiency in perovskite and earth abundant Cu-Zn-Sn-S-Se material based solar cells.
Rondiya et al, Chemistry of Materials, 29, 3133-3142, 2017. (10.1021/acs.chemmater.7b00149)

(b) Novel Strategies to improve solar cells efficiency – Activities in my research range for conceiving and creating new materials, through to theoretical understanding of optoelectronic process in devices. Currently, I am investigating the stability issues in higher efficiency based perovskite solar cells. Recently, we have achieved the stabilized power conversion efficiency of 16.78 % (small active area 0.3 × 0.3 cm2) and 15.82 % (large active area 1 × 1 cm2) under 100 mWcm-2 irradiation 5% A+ incorporation with QDs passivation in CsPbI2Br based device. In one more project, we demonstrated PCE of 17.45 % (under reverse scan) for small area (0.09 cm2) with record open-circuit voltage (VOC) of 1.334 V and fill factor (FF) of 80.1% for fully air-processed dynamic hot-air assisted M:CsPbI2Br (M: A2+, B3+) for stable all-inorganic perovskite solar cells.
Waykar et al, .J. Phys. Chem. Solids, 146, 109608, 2020. (10.1016/j.jpcs.2020.109608)
Bhorde et al, New J. Chem., 44, 11282, 2020. (10.1039/d0nj01806f)

Photovoltaic