Influence of Non-Fullerene-Blend Morphology on Charge Generation and Transfer in Organic Bulk Heterojunction Solar Cells
James Durrant a, Hyojung Cha a, Sarah Holliday a, Iain Mcculloch a
a Imperial College London, United Kingdom, South Kensington, Londres, Reino Unido, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Hyojung Cha, 200
Publication date: 28th March 2016

Here we report a comparison of the morphology as well as the charge carrier dynamics for organic bulk heterojunction solar cells employing the high crystalline conjugated polymer in blends with two electron acceptors: fullerene derivative, PC71BM and rhodanine- based non- fullerene small molecule. We employ femtosecond transient absorption spectroscopy and atomic force microscopy and GIWAXS to show a correlation between morphology and the kinetics of polaron generation from excitons in donor or acceptor, and relate these observations to device efficiency. Charge generation and charge carrier dynamic are found to be strongly affected by blend films morphology with both acceptors. We is found that rhodanine acceptor matches well with polymer and non-fullerene organic solar cells with an impressive VOC of 1.11 V, and a high power conversion efficiency of 7.0% is achieved. The relatively lower device performance for the rhodanine acceptor (compared to 10.3 % for the equivalent PC71BM device) is shown to result from a lower yield of dissociated polarons, increasing geminate recombination losses.



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