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; Richard H. Friend

doi:10.1038/s41467-017-02457-5

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, Richard H. Friend

Research output: Contribution to journal › Article › peer-review

120 Scopus citations

Abstract

Donor–acceptor organic solar cells often show low open-circuit voltages (VOC) relative to their optical energy gap (Eg) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between Eg 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 (Eg−ECT ~ 50 meV) and a high internal quantum efficiency (ηIQE ~ 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 (

Original language	English (US)
Journal	Nature Communications
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41467-017-02457-5
State	Published - Jan 18 2018
Externally published	Yes

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

abstract = "Donor–acceptor organic solar cells often show low open-circuit voltages (VOC) relative to their optical energy gap (Eg) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between Eg 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 (Eg−ECT ~ 50 meV) and a high internal quantum efficiency (ηIQE ~ 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 (",

author = "Menke, {S. Matthew} and Alexandre Cheminal and Patrick Conaghan and Ran, {Niva A.} and Greehnam, {Neil C.} and Bazan, {Guillermo C.} and Thuc-Quyen Nguyen and Akshay Rao and Friend, {Richard H.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We would like to acknowledge Professor Ren{\'e} Janssen and Professor Weiwei Li for supply of the PDPP polymers and fruitful discussion. S.M.M. and R.H.F. acknowledge support from the KAUST Competitive Research Grant Program. N.A.R., T.-Q.N. and G.C.B. acknowledge support from the Department of the Navy, Office of Naval Research (award nos. N00014-14-1-0580 and N00014-16-1-25200). A.C., P.C., N.C.G. and A.R. acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) and the Winton Programme for the Physics of Sustainability. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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AU - Menke, S. Matthew

AU - Cheminal, Alexandre

AU - Conaghan, Patrick

AU - Ran, Niva A.

AU - Greehnam, Neil C.

AU - Bazan, Guillermo C.

AU - Nguyen, Thuc-Quyen

AU - Rao, Akshay

AU - Friend, Richard H.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We would like to acknowledge Professor René Janssen and Professor Weiwei Li for supply of the PDPP polymers and fruitful discussion. S.M.M. and R.H.F. acknowledge support from the KAUST Competitive Research Grant Program. N.A.R., T.-Q.N. and G.C.B. acknowledge support from the Department of the Navy, Office of Naval Research (award nos. N00014-14-1-0580 and N00014-16-1-25200). A.C., P.C., N.C.G. and A.R. acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) and the Winton Programme for the Physics of Sustainability. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2018/1/18

Y1 - 2018/1/18

N2 - Donor–acceptor organic solar cells often show low open-circuit voltages (VOC) relative to their optical energy gap (Eg) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between Eg 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 (Eg−ECT ~ 50 meV) and a high internal quantum efficiency (ηIQE ~ 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 (

AB - Donor–acceptor organic solar cells often show low open-circuit voltages (VOC) relative to their optical energy gap (Eg) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between Eg 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 (Eg−ECT ~ 50 meV) and a high internal quantum efficiency (ηIQE ~ 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 (

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

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