Research Fellows Directory
Dr Ravichandran Shivanna
University of Cambridge
Advancing the power conversion efficiency of solution processed low cost organic and inorganic hybrid solar cells is the core of my research. My doctoral work deals with exploring and understanding photo-charge generation in organic bulk heterojunction (BHJ) solar cells featuring non-fullerene acceptors. We have utilized a perylenediimide based acceptor with high electron mobility and extinction coefficient and achieved a power conversion efficiency of greater than 4.6 percent which is one among the highest performing fullerene-free organic solar cells. Photocharge generation dynamics in these cells are studied using ultrafast transient absorption measurement techniques (femto-micro second).
I have worked extensively with Near-field Scanning Optical Microscopy (NSOM) and different modes of Atomic Force Microscopy (AFM) to study structural, mechanical and electrical properties to map optoelectronic properties across donor-acceptor interface. With this expertise, my recent interest is to integrate near-field optical microscopy with ultra-fast transient techniques to study spatio-temporal mapping of charge generation across semiconducting nano-interfaces, "ultrafast optical microscopy", particularly on nanocrystals and its heterostructures.