TY  - JOUR
A1  - Zhong, Yufei
A1  - Causa, Martina
A1  - Moore, Gareth John
A1  - Krauspe, Philipp
A1  - Xiao, Bo
A1  - Günther, Florian
A1  - Kublitski, Jonas
A1  - BarOr, Eyal
A1  - Zhou, Erjun
A1  - Banerji, Natalie
T1  - Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers
JF  - Nature Communications
N2  - Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low driving force potentially slows down charge generation, leading to a tradeoff between voltage and current. Here, we disentangle the intrinsic charge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems. Moreover, we establish the influence of the interfacial energetics on the electron and hole transfer rates separately. We demonstrate that charge-transfer timescales remain at a few hundred femtoseconds even at near-zero driving force, which is consistent with the rates predicted by Marcus theory in the normal region, at moderate electronic coupling and at low re-organization energy. Thus, in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff.
KW  - organic solar cell
KW  - electron-transfer
KW  - Donor-Acceptor (DA) interface
KW  - transfer dynamics
KW  - donor
KW  - seperation
KW  - efficiency
KW  - impact
KW  - energy
KW  - photovoltaics
Y1  - 2020
U6  - https://doi.org/10.1038/s41467-020-14549-w
SN  - 2041-1723
VL  - 11
IS  - 1
SP  - 1
EP  - 10
PB  - Nature Publishing Group UK
CY  - London
ER  - 
TY  - GEN
A1  - Zhong, Yufei
A1  - Causa, Martina
A1  - Moore, Gareth John
A1  - Krauspe, Philipp
A1  - Xiao, Bo
A1  - Günther, Florian
A1  - Kublitski, Jonas
A1  - BarOr, Eyal
A1  - Zhou, Erjun
A1  - Banerji, Natalie
T1  - Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers
T2  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low driving force potentially slows down charge generation, leading to a tradeoff between voltage and current. Here, we disentangle the intrinsic charge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems. Moreover, we establish the influence of the interfacial energetics on the electron and hole transfer rates separately. We demonstrate that charge-transfer timescales remain at a few hundred femtoseconds even at near-zero driving force, which is consistent with the rates predicted by Marcus theory in the normal region, at moderate electronic coupling and at low re-organization energy. Thus, in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1422 
KW  - organic solar cell
KW  - electron-transfer
KW  - Donor-Acceptor (DA) interface
KW  - transfer dynamics
KW  - donor
KW  - seperation
KW  - efficiency
KW  - impact
KW  - energy
KW  - photovoltaics
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-511936
SN  - 1866-8372
IS  - 1
ER  -