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HL: Fachverband Halbleiterphysik

HL 60: Perovskite and photovoltaics V (joint session HL/CPP)

HL 60.7: Vortrag

Donnerstag, 19. März 2020, 11:30–11:45, POT 251

Singlet Fission Processes in Hybrid Organo-Metal Halide Perovskites Semiconductors — •Karunanantharajah Prashanthan^1,2, Klaus Lips¹, Simone Raoux¹, and Rowan MacQueen¹ — ¹Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH — ²Department of Physics, University of Jaffna, Jaffna, Sri Lanka

Solar cells made from Organo-Metal Halide Perovskites show power conversion efficiency very close to the record efficiency of commercially available thin film technologies. Looking to the future of these devices, there exists promising approaches to push the efficiency beyond the Shockley-Queisser single junction thermodynamic limit. Singlet fission is a quantum mechanical process which occurs in various organic molecules, whereby a photogenerated high-energy singlet exciton spontaneously splits into two lower-energy triplet excitons. In this work, we present the possible routes and challenges involved in combining singlet fission materials with low bandgap hybrid metal halide perovskite solar cells. Using time-resolved photoluminescence spectroscopy we investigate the dynamic processes involved in singlet fission and the subsequent injection of energy and charge into the perovskite layer. The objective is to form augmented photovoltaic devices which can efficiently harvest triplets from a singlet fission layer, substantially reducing the energy loss to carrier thermalization.