Imperial College London
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Professor Martyn A McLachlan

Faculty of Engineering, Department of Materials

Professor of Thin Films, Interfaces and Electronic Devices
 
 
 
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Contact

 

+44 (0)20 7594 9692martyn.mclachlan Website

 
 
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Location

 

401 HMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{McLachlan:2017:10.1021/acs.cgd.7b01222,
author = {McLachlan, MA and Morbidoni, M and Burgess, CH and Wu, J and Harrabi, K and Payne, DJ and Durrant, J},
doi = {10.1021/acs.cgd.7b01222},
journal = {Crystal Growth and Design},
pages = {6559--6564},
title = {Nanoscale structure-property relationships in low temperature solution-processed electron transport layers for organic photovoltaics},
url = {http://dx.doi.org/10.1021/acs.cgd.7b01222},
volume = {17},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Here we elucidate the nanostructure–property relationships in low-temperature, solution-processed ZnO based thin films employed as novel electron transport layers (ETLs) in organic photovoltaic (OPV) devices. Using a low-cost zinc precursor (zinc acetate) in a simple amine–alcohol solvent mix, high-quality ETL thin films are prepared. We show that at a processing temperature of 110 °C the films are composed of nanoparticles embedded in a continuous organic matrix consisting of ZnO precursor species and stabilizers. Using a combination of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), we study the thermally induced morphological and compositional changes in the ETLs. Transient optoelectronic probes reveal that the mixed nanocrystalline/amorphous nature of the films does not contribute to recombination losses in devices. We propose that charge transport in our low-temperature processed ETLs is facilitated by the network of ZnO nanoparticles, with the organic matrix serving to tune the work function of the ETL and to provide excellent resistance to current leakage. To demonstrate the performance of our ETLs we prepare inverted architecture OPVs utilizing Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7): [6,6]-Phenyl-C71-butyric acid methyl ester (PC71BM) as active layer materials. The low-temperature ETL devices showed typical power conversion efficiencies (PCEs) of >7% with the champion devices achieving a PCE > 8%.
AU  - McLachlan,MA
AU  - Morbidoni,M
AU  - Burgess,CH
AU  - Wu,J
AU  - Harrabi,K
AU  - Payne,DJ
AU  - Durrant,J
DO  - 10.1021/acs.cgd.7b01222
EP  - 6564
PY  - 2017///
SN  - 1528-7483
SP  - 6559
TI  - Nanoscale structure-property relationships in low temperature solution-processed electron transport layers for organic photovoltaics
T2  - Crystal Growth and Design
UR  - http://dx.doi.org/10.1021/acs.cgd.7b01222
UR  - http://hdl.handle.net/10044/1/52650
VL  - 17
ER  -
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