Imperial College London
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DrYifanDong

Faculty of Natural Sciences, Department of Chemistry

 
 
 
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Contact

 

yifan.dong12 Website

 
 
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Location

 

G22Molecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Dong:2020:10.1038/s41467-020-18439-z,
author = {Dong, Y and Nikolis, VC and Talnack, F and Chin, Y-C and Benduhn, J and Londi, G and Kublitski, J and Zheng, X and Mannsfeld, SCB and Spoltore, D and Muccioli, L and Li, J and Blase, X and Beljonne, D and Kim, J-S and Bakulin, AA and D'Avino, G and Durrant, JR and Vandewal, K},
doi = {10.1038/s41467-020-18439-z},
journal = {Nature Communications},
title = {Orientation dependent molecular electrostatics drives efficient charge generation in homojunction organic sol},
url = {http://dx.doi.org/10.1038/s41467-020-18439-z},
volume = {11},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Organic solar cells usually utilise a heterojunction between electron-donating (D) and electron-accepting (A) materials to split excitons into charges. However, the use of D-A blends intrinsically limits the photovoltage and introduces morphological instability. Here, we demonstrate that polycrystalline films of chemically identical molecules offer a promising alternative and show that photoexcitation of α-sexithiophene (α-6T) films results in efficient charge generation. This leads to α-6T based homojunction organic solar cells with an external quantum efficiency reaching up to 44% and an open-circuit voltage of 1.61 V. Morphological, photoemission, and modelling studies show that boundaries between α-6T crystalline domains with different orientations generate an electrostatic landscape with an interfacial energy offset of 0.4 eV, which promotes the formation of hybridised exciton/charge-transfer states at the interface, dissociating efficiently into free charges. Our findings open new avenues for organic solar cell design where material energetics are tuned through molecular electrostatic engineering and mesoscale structural control.
AU  - Dong,Y
AU  - Nikolis,VC
AU  - Talnack,F
AU  - Chin,Y-C
AU  - Benduhn,J
AU  - Londi,G
AU  - Kublitski,J
AU  - Zheng,X
AU  - Mannsfeld,SCB
AU  - Spoltore,D
AU  - Muccioli,L
AU  - Li,J
AU  - Blase,X
AU  - Beljonne,D
AU  - Kim,J-S
AU  - Bakulin,AA
AU  - D'Avino,G
AU  - Durrant,JR
AU  - Vandewal,K
DO  - 10.1038/s41467-020-18439-z
PY  - 2020///
SN  - 2041-1723
TI  - Orientation dependent molecular electrostatics drives efficient charge generation in homojunction organic sol
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-020-18439-z
UR  - https://www.ncbi.nlm.nih.gov/pubmed/32934236
UR  - http://hdl.handle.net/10044/1/82657
VL  - 11
ER  -
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