Imperial College London

DrHyojungCha

Faculty of Natural SciencesDepartment of Chemistry

 
 
 
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h.cha

 
 
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Location

 

G22Molecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wu:2019:10.1038/s41467-019-12951-7,
author = {Wu, J and Luke, J and Lee, HKH and Tuladhar, PS and Cha, H and Jang, S-Y and Tsoi, WC and Heeney, M and Kang, H and Lee, K and Kirchartz, T and Kim, J-S and Durrant, JR},
doi = {10.1038/s41467-019-12951-7},
journal = {Nature Communications},
title = {Tail state limited photocurrent collection of thick photoactive layers in organic solar cells},
url = {http://dx.doi.org/10.1038/s41467-019-12951-7},
volume = {10},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Weanalyseorganic solar cells with four differentphotoactive blends exhibiting differing dependencies ofshort-circuit current upon photoactive layer thickness.These blends and devices are analysedbytransient optoelectronic techniques ofcarrier kinetics and densities, airphotoemission spectroscopyof material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We concludethat,for the device series studied, the photocurrent losswith thick active layersis primarilyassociatedwith the accumulation of photo-generated charge carriers in intra-bandgap tail states.This charge accumulation screens the device internal electricalfield, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail statedistribution anddensity and increase the maximal photoactive thickness forefficient operation. Ourwork suggests that selectingorganic photoactive layerswith a narrow distribution of tail states isa keyrequirement for the fabrication of efficient, high photocurrent, thick organic solar cells.
AU - Wu,J
AU - Luke,J
AU - Lee,HKH
AU - Tuladhar,PS
AU - Cha,H
AU - Jang,S-Y
AU - Tsoi,WC
AU - Heeney,M
AU - Kang,H
AU - Lee,K
AU - Kirchartz,T
AU - Kim,J-S
AU - Durrant,JR
DO - 10.1038/s41467-019-12951-7
PY - 2019///
SN - 2041-1723
TI - Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
T2 - Nature Communications
UR - http://dx.doi.org/10.1038/s41467-019-12951-7
UR - http://hdl.handle.net/10044/1/74311
VL - 10
ER -