Dr Chung Tsoi
Senior Research Officer
Telephone: (01792) 606646
Room: Open Plan Office - A224
Second Floor
Engineering East
Bay Campus

Dr Wing Chung Tsoi is a Senior Research Officer. His research interests are mainly focus on solution-process photovoltaic/solar cells, including organic solar cells, perovskite solar cells...He is particularly interested in understanding the structure-property-performance relationship of the photovoltaic/solar cells, in order to understand the fundamentals and to improve the performance, particularly the stability of the photovoltaic/solar cells. His expertise is on developing/applying advanced (nano-) characterization methods to probe the structures/morphology of the photovoltaic thin films, and correlate it to the properties and performances. His particularly expertise is on advanced Raman spectroscopy and functional atomic force microscopy (AFM).

Areas of Expertise

  • Raman spectroscopy
  • Organic solar cells
  • Degradation Studies
  • Novel application of photovoltaics
  • advanced characterization of printable solar cells


  1. Toward Improved Environmental Stability of Polymer:Fullerene and Polymer:Non-fullerene Organic Solar Cells: A Common Energetic Origin of Light and Oxygen Induced Degradation. ACS Energy Letters
  2. & Twist and Degrade-Impact of Molecular Structure on the Photostability of Nonfullerene Acceptors and Their Photovoltaic Blends. Advanced Energy Materials, 1803755
  3. & Outstanding Indoor Performance of Perovskite Photovoltaic Cells - Effect of Device Architectures and Interlayers. Solar RRL 3(1), 1800207
  4. & Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices. Journal of Materials Chemistry A 6(46), 23578-23586.
  5. & Localized effect of PbI2 excess in perovskite solar cells probed by high-resolution chemical–optoelectronic mapping. Journal of Materials Chemistry A 6(45), 23010-23018.

See more...


  • EG-040 Electricity and Magnetism

    To introduce the students to the fundamentals of electricity and magnetism.


  • Advanced Raman-based Mapping of Perovskite Solar Cells. (current)

    Student name:
    Other supervisor: Dr Jeremy Barbe
  • Transparent Conductive Glass Substrates for PV Application (current)

    Student name:
    Other supervisor: Prof James Durrant
  • Stability and upscaling of OPV (current)

    Student name:
    Other supervisor: Prof James Durrant
  • Feasibility of Perovskite Solar Cells for Space Applications (current)

    Student name:
    Other supervisor: Prof Trystan Watson
  • The Role of Electron Acceptors (current)

    Student name:
    Other supervisor: Prof James Durrant
  • 'Raman spectroscopy for advanced study of printable solar cells' (awarded 2018)

    Student name:
    Other supervisor: Prof Trystan Watson

Additional Information

Dr Wing Chung Tsoi obtained his higher diploma in Applied Physics from The Hong Kong Polytechnic University. He then obtained BSc in Physics with Lasers and Photonics from The University of Hull. He obtained his PhD in Physics (Title of Thesis: Polymerisable Liquid Crystals for Organic Photovoltaics) under supervision of Prof. Mary O'Neill at The University of Hull in 2006.

During his PhD, he discovered novel light absorbing, charge transporting liquid crystals can be used as PV materials and to fine tune its nano-morphology to significantly improve the efficiency of the PV. [1] He then took a postdoctoral position under Prof. David Lidzey at The University of Sheffield, working on organic semiconducting materials for novel ultrafast optical switching. During the period, he discovered that an interesting and special phase, so called "beta-phase" can be formed with fluorene oligomers. [2]

From 2009, he obtained a EPSRC-NPL postdoctoral partnership which allowed him to work both at Imperial College (under Dr Ji-Seon Kim) and National Physical Laboratory (NPL). During the period, he was able to apply resonant Raman spectroscopy as a simple and powerful way to quantify the degree of molecular order in organic photovoltaic films. [3], and also co-developed with NPL a photo-conductive AFM. [4]

From 2012, he participated in a TSB project (under Dr Ji-Seon Kim and Prof. Donal Bradley), and demonstrated that Raman can be a valuable technique to probe degradation of organic PV [5], and also fabricated the first (UK academics) large area organic PV module with efficiency as high as 4% on FTO substrate using scalable fabrication methods.

From 2014, he was awarded Knowledge Transfer Secondment (KTS) under Prof. Jenny Nelson (Imperial College) and Dr Fernando Castro (NPL) on advanced methods to characterize degradation of organic PV modules. From September 2014, he took up the current position, and is developing a research group on advanced characterization of PVs, particularly on advanced Raman techniques, and stability characterization.

His research is recently extended to the development of printable PV for indoor light application, and visibly transparent solar cells. Dr Tsoi is currently supervising a Postdoc (Dr Harrison Lee), a PhD student (Emily Speller), and a Master by Research student (Michael Newman) as part of his research group.

[1] Adv. Mater. 18, 1754 (2006)
[2] Adv. Funct. Mater. 18, 600 (2008)
[3] J. Am. Chem. Soc. 133, 9834 (2011)
[4] Energy Environ. Sci. 4, 3646 (2011)
[5] Nat. Commun. 4, 2227 (2013)