@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}
}

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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  - 

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