Imperial College London
Portrait Picture

Professor James Durrant, CBE, FRS

Faculty of Natural Sciences, Department of Chemistry

Professor of Photochemistry
 
 
 
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Contact

 

+44 (0)20 7594 5321j.durrant Website

 
 
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Assistant

 

Miss Lisa Benbow +44 (0)20 7594 5883

 
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Location

 

G22CMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Labanti:2022:10.1038/s41467-022-31367-4,
author = {Labanti, C and Wu, J and Shin, J and Limbu, S and Yun, S and Fang, F and Park, SY and Heo, C-J and Lim, Y and Choi, T and Kim, H-J and Hong, H and Choi, B and Park, K-B and Durrant, J and Kim, J-S},
doi = {10.1038/s41467-022-31367-4},
journal = {Nature Communications},
pages = {1--10},
title = {Light-intensity dependent photoresponse time of organic photodetectors and its molecular origin},
url = {http://dx.doi.org/10.1038/s41467-022-31367-4},
volume = {13},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Organic photodetectors (OPDs) exhibit superior spectral responses but slower photoresponse times compared to inorganic counterparts. Herein, we study the light-intensity-dependent OPD photoresponse time with two small-molecule donors (planar MPTA or twisted NP-SA) co-evaporated with C 60 acceptors. MPTA:C60 exhibits the fastest response time at high-lightintensities (>0.5 mW/cm 2), attributed to its planar structure favoring strong intermolecular interactions. However, this blend exhibits the slowest response at low-light intensities, which is correlated with biphasic photocurrent transients indicative of the pr esence of a low density of deep trap states. Optical, structural and en ergetical analyses indicate that MPTA molecular packing is strongly disrupted by C 60, resulting in a larger (370 meV) HOMO level shift. This results in greater energetic inhomogeneity including possible MPTA-C 60 adduct formation, leading to deep trap states which limit the low-light photoresponse time. This work provides important insights into the small molecule design rules critical for low charge-trapping and high-speed OPD applications.
AU  - Labanti,C
AU  - Wu,J
AU  - Shin,J
AU  - Limbu,S
AU  - Yun,S
AU  - Fang,F
AU  - Park,SY
AU  - Heo,C-J
AU  - Lim,Y
AU  - Choi,T
AU  - Kim,H-J
AU  - Hong,H
AU  - Choi,B
AU  - Park,K-B
AU  - Durrant,J
AU  - Kim,J-S
DO  - 10.1038/s41467-022-31367-4
EP  - 10
PY  - 2022///
SN  - 2041-1723
SP  - 1
TI  - Light-intensity dependent photoresponse time of organic photodetectors and its molecular origin
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-022-31367-4
UR  - https://www.nature.com/articles/s41467-022-31367-4
UR  - http://hdl.handle.net/10044/1/97860
VL  - 13
ER  -
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