Perovskite and Organic photovoltaics
Fig 1: Organic photovoltaic devices fabricated onto a flexible plastic substrate (photo by Lucy Pickford).
Fig 2: Standard architecture perovskite photovoltaic devices.
Third generation thin-film photovoltaics (PV) are of significant interest
for low-cost generation of solar electricity, as they potentially combine reduced embodied
energy, with ease of manufacture using solution-based techniques. At Sheffield, we have a
detailed research programme into the development of photovoltaics based on two main types of
semiconducting materials (i) organo-metal halide perovkites and (ii) polymer:fullerene blends.
In both cases, such materials can be coated onto a surface using solution-based techniques
(including spray-coating), and then fabricated into a PV device. We are currently exploring
a range of different new perovskite and organic semiconductor materials, with our objective
being to optimise device efficiency, maximise device stability and to develop techniques
appropriate for device scale-up and manufacture. In our research, we use a range of
spectroscopic techniques to understand the electronic properties of the materials we develop,
together with other structural probes (including X-ray scattering) to understand thin-film
morphology over a range of length-scales.
We also have an outdoors testing facility at the Sheffield Solar Farm. This acts as a
long-term testing environment for photovoltaic devices made in the laboratory. Three
encapsulation chambers expose test devices to sunlight, whilst protecting them from moisture
and oxygen in an inert nitrogen atmosphere.
Fig 3: Hermetically sealed chambers protect new photovoltaic devices
while they undergo long-term testing at the Sheffield Solar farm. Photo by Ellie Scott, courtesy Ossila.
Light-Soaking-Free Inverted Polymer Solar Cells with an Efficiency of 10.5% by Compositional and Surface Modifications to a Low-Temperature-Processed TiO2 Electron-Transport Layer
Yu Yan, Feilong Cai, Liyan Yang, Jinghai Li, Yiwei Zhang, Fei Qin, Chuanxi Xiong, Yinhua Zhou, David G. Lidzey, Tao Wang
Advanced Materials, Volume 29, January 4 2017, 1604044
Open Article: Mapping Morphological and Structural Properties of Lead Halide Perovskites by Scanning Nanofocus XRD
Samuele Lilliu, Thomas G. Dane, Mejd Alsari, Jonathan Griffin, Alexander T. Barrows, Marcus S. Dahlem, Richard H. Friend, David G. Lidzey,
and J. E. Macdonald
Advanced Functional Materials, Volume 26, Issue 45, page 8221-8230, 12 October 2016
PCDTBT based solar cells: one year of operation under real-world conditions
Yiwei Zhang, Edward Bovill, James Kingsley, Alastair R. Buckley, HunanYi, Ahmed Iraqi, Tao Wang & David G. Lidzey
Nature Scientific Reports, February 2016
Polymer Solar Cells: Fabricating High Performance, Donor–Acceptor Copolymer Solar Cells by Spray-Coating in Air
Tao Wang, Nicholas W. Scarratt, Hunan Yi, Alan D. F. Dunbar, Andrew J. Pearson, Darren C. Watters, Tom S. Glen,
Andrew C. Brook, James Kingsley, Alastair R. Buckley, Maximilian W. A. Skoda, Athene M. Donald, Richard A. L. Jones,
Ahmed Iraqi and David G. Lidzey
Advanced Energy Materials, Volume 3, Issue 4, page 410, April 2013
Correlating Structure with Function in Thermally Annealed PCDTBT:PC70BM Photovoltaic Blends
Tao Wang, Andrew J. Pearson, Alan D. F. Dunbar, Paul A. Staniec, Darren C. Watters, Hunan Yi,
Anthony J. Ryan, Richard A. L. Jones, Ahmed Iraqi and David G. Lidzey,
Advanced Functional Materials, Volume 22, Issue 7, pages 1399–1408, April 10, 2012
Efficient planar heterojunction mixed-halide perovskite solar cells deposited via spray-deposition
Alexander T. Barrows, Andrew J. Pearson, Chan Kyu Kwak, Alan D. F. Dunbar, Alastair R. Buckley and David G. Lidzey
Energy Environ. Sci., 2014, Volume 7, pages 2944-2950
(PDF compressed from original, 346kB)
Ossila - enabling innovative electronics (spin out company from the EPMM group)
Ahmed Iraqi's research group
The Polymer Centre