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17 September 2018 Charge separation and collection in organic solar cells (Conference Presentation)
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My talk will address three related topics in organic solar cells. I will initially address the issue of whether interfacial electron / hole pairs (i.e.: charge transfer states) are bound and unbound in organic donor / acceptor blends. In particular I will present a range of kinetic and structural data indicating that the behavior of such states depend strongly upon interface structure. Interfaces within molecular mixed domains can yield relatively bound states which can undergo significant geminate recombination losses. In contrast, for the same donor / acceptor materials, interfaces between domains can yield efficient charge separation with minimal geminate losses. I will then go on to address the importance of geminate recombination losses in limiting photocurrent generation in polymer / non-fullerene acceptor solar cells, and the role of energy level tuning in minimizing such losses. Finally I will go to address the challenge of achieving efficient charge collection in organic solar cells with active layer thicknesses large enough for scalable device manufacture. In particular I will address the role of space charge layer formation caused by charge trapping in shallow tail states, and the requirement that efficient photocurrent generation in thick organic solar cells requires minimizing the density of these tail states.
Conference Presentation
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James R. Durrant "Charge separation and collection in organic solar cells (Conference Presentation)", Proc. SPIE 10724, Physical Chemistry of Semiconductor Materials and Interfaces XVII, 107240M (17 September 2018);

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