Low temperature solution processed electron transport layers for organic and hybrid solar cells

Jiaqi Zhang^a, Martyn A. McLachlan^a

^aDepartment of Materials and Center for Plastic Electronics, Imperial College London

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)

Swansea, United Kingdom, 2016 June 29th - July 1st

Organizers: James Durrant, Henry Snaith and David Worsley

Poster, Jiaqi Zhang, 196
Publication date: 28th March 2016

We highlight a novel, low temperature processed ZnO layer as an excellent electron transport layer (ETL) in inverted polymer solar cells. Our ETL is composed of ZnO nanoparticles embedded in an organic matrix, originating from our precursor and solvent materials. Using the well-studied active layer P3HT:ICBA and PTB7:PC71BM – ETL processing temperatures from 25 C - 450 C are explored and the role crystallinity, structure, charge transport and work function on the device performance characteristics are investigated. Implementing a low temperature (110 C) processed ETL improves device power conversion efficiency (PCE) by > 50% compared with high temperature (450 C) processed ZnO. Although the low temperature ETLs have lower electron mobility compared with their high temperature analogues we show that charge recombination at the ETL/active layer in both systems is comparable. We attribute the improved performance observed in low temperature ETLs to significant shifts in work function due to the thermal processing route employed. We have investigated similar ETL materials and their surface modified derivatives for low-hysteresis, thermally stable, efficient perovskite solar cells in planar and conventional architectures. This work highlights the importance of interlayer control in multilayer photovoltaic devices and presents a convenient ETL material compatible with a range of device platforms and processing methodologies.

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