Order enables efficient electron-hole separation at an organic heterojunction with a small energy loss

S. Matthew Menke, Alexandre Cheminal, Patrick Conaghan, Niva A. Ran, Neil C. Greehnam, Guillermo C. Bazan, Thuc-Quyen Nguyen, Akshay Rao () and Richard H. Friend ()
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S. Matthew Menke: University of Cambridge
Alexandre Cheminal: University of Cambridge
Patrick Conaghan: University of Cambridge
Niva A. Ran: University of California, Santa Barbara
Neil C. Greehnam: University of Cambridge
Guillermo C. Bazan: University of California, Santa Barbara
Thuc-Quyen Nguyen: University of California, Santa Barbara
Akshay Rao: University of Cambridge
Richard H. Friend: University of Cambridge

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Donor–acceptor organic solar cells often show low open-circuit voltages (V OC) relative to their optical energy gap (E g) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between E g and that of intermolecular charge transfer (CT) states at the donor–acceptor interface. Here we study charge generation occurring in PIPCP:PC61BM, a system with a very low driving energy for initial charge separation (E g−E CT ~ 50 meV) and a high internal quantum efficiency (η IQE ~ 80%). We track the strength of the electric field generated between the separating electron-hole pair by following the transient electroabsorption optical response, and find that while localised CT states are formed rapidly (

Date: 2018
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DOI: 10.1038/s41467-017-02457-5

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