Relating Material Properties to Charge Recombination in Organic Heterojunction Solar Cells
Jenny Nelson a
a Imperial College London, South Kensington, London,, United Kingdom
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker, Jenny Nelson, presentation 139
Publication date: 7th November 2016

In any photovoltaic device, efficient energy conversion results from a competition between light harvesting, charge separation and transport, and charge recombination. Devices based on disordered materials such as molecular and hybrid semiconductors, despite showing impressive advances in performance recently, typically show greater losses to recombination than traditional crystalline semiconductor devices. Losses to non-radiative recombination can be quantified using luminescence techniques and for some systems these losses have been correlated with trends in charge carrier lifetime and mobility. Here, we attempt to relate the measured recombination losses to material properties quantitatively. We will investigate the relationship in several different polymer: fullerene systems where we can tune, respectively, the density of defect states, the degree of recombination at the electrodes, and the driving force for charge separation. We will comment on the extent to which disorder controls the losses to recombination.

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