Imperial College London
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DrArtemBakulin

Faculty of Natural Sciences, Department of Chemistry

Reader in Physical Chemistry
 
 
 
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G22aMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2019:10.1002/aenm.201902145,
author = {Zhang, J and Futscher, M and Lami, V and Kosasih, F and Cho, C and Gu, Q and Sadhanala, A and Pearson, A and Kan, B and Divitini, G and Wan, X and Credgington, D and Greenham, N and Chen, Y and Ducati, C and Ehrler, B and Vaynzof, Y and Friend, R and Bakulin, A},
doi = {10.1002/aenm.201902145},
journal = {Advanced Energy Materials},
title = {Sequentially deposited versus conventional nonfullerene organic solar cells: interfacial trap states, vertical stratification, and exciton dissociation},
url = {http://dx.doi.org/10.1002/aenm.201902145},
volume = {9},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Bulk-heterojunction (BHJ) non-fullerene organic solar cells prepared from sequentially deposited donor and acceptor layers (sq-BHJ) have recently been promising to be highly efficient, environmentally friendly, and compatible with large area and roll-to-roll fabrication. However, the related photophysics at donor-acceptor interface and the vertical heterogeneity of donor-acceptor distribution, critical for exciton dissociation and device performance, are largely unexplored. Herein, steady-state and time-resolved optical and electrical techniques are employed to characterize the interfacial trap states. Correlating with the luminescent efficiency of interfacial states and its non-radiative recombination, interfacial trap states are characterized to be about 50% more populated in the sq-BHJ devices than the as-cast BHJ (c-BHJ), which probably limits the device voltage output. Cross-sectional energy-dispersive X-ray spectroscopy and ultraviolet photoemission spectroscopy depth profiling directly visualize the donor-acceptor vertical stratification with a precision of 1-2 nm. From the proposed “needle” model, the high exciton dissociation efficiency is rationalized. Our study highlights the promise of sequential deposition to fabricate efficient solar cells, and points towards improving the voltage output and overall device performance via eliminating interfacial trap states.
AU  - Zhang,J
AU  - Futscher,M
AU  - Lami,V
AU  - Kosasih,F
AU  - Cho,C
AU  - Gu,Q
AU  - Sadhanala,A
AU  - Pearson,A
AU  - Kan,B
AU  - Divitini,G
AU  - Wan,X
AU  - Credgington,D
AU  - Greenham,N
AU  - Chen,Y
AU  - Ducati,C
AU  - Ehrler,B
AU  - Vaynzof,Y
AU  - Friend,R
AU  - Bakulin,A
DO  - 10.1002/aenm.201902145
PY  - 2019///
SN  - 1614-6832
TI  - Sequentially deposited versus conventional nonfullerene organic solar cells: interfacial trap states, vertical stratification, and exciton dissociation
T2  - Advanced Energy Materials
UR  - http://dx.doi.org/10.1002/aenm.201902145
UR  - http://hdl.handle.net/10044/1/74267
VL  - 9
ER  -
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