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Fangyuan Jiang, PhD

fyjiang@uw.edu

CV

  • Postdoc, University of Washington, 2024
  • Editor, Advanced Materials – family journals, Wiley, 2021
  • PhD Exchange Researcher, University of Washington, 2020
  • PhD, Huazhong University of Science and Technology, 2020
  • PhD Exchange Researcher, EPFL, 2018
  • BS, Huazhong University of Science and Technology, 2014

Committed to clean energy, innovation, and sustainability

I have made seminal contributions in new semiconductors with applications in optoelectronics and energy conversion. My research ranges from assembling the world’s first monolithic all-perovskite tandem solar cell, demonstrating record-high efficiency for Sb3+/Bi3+ based perovskite solar cells, to solving the “notorious” reverse bias instability of perovskite photovoltaics, and providing key characterizations that in-turn guide materials synthesis/selection for single-junction and all-perovskite tandem solar cells with record-high efficiency and/or stability.

I have published >40 papers in peer-reviewed journals (including the top tier journals such as Science, Nature Energy, JACS, Nature Communications, Advanced Materials etc.) with > 2700 total citations and a Google H-index of 29 (08/2024). I have built a large collaboration network with scientists/institutions worldwide, including US, China, UK, Singapore, Germany, Switzerland etc.

About me

Selected Publications

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Reverse Bias Stressing

  • We show that, via device architecture engineering, perovskite solar cells can exhibit reverse bias breakdown voltages that also compete with silicon photovoltaics, and can survive under harsh reverse bias stressing for many hours without damage. This brings confidence to the whole perovskite photovoltaics community to accelerate the commercialization pace of this unprecedented solar technology.
  • Nat. Energy, 2024 (first co-author)

Efficient Defect Passivation

  • We conducted hyperspectral photoluminescence microscopy to pinpoint the buried interface as the critical factor limiting the stability of perovskite solar cells. This leads to a successful collaboration where our collaborators demonstrated perovskite solar cells with exceptional efficiency and stability through efficient defect passivation.

Heterogeneity&Photo Stability

  • We conducted correlative microscopy to study the interplay between nanoscale compositional heterogeneity and photo stability. We found that local A-site phase segregation leads to Cs-rich regions showing accelerated photodegradation in mixed-cation perovskite semiconductor films.

Lead-Free Perovskite Solar Cells

  • We demonstrate that Cl incorporation in CH3NH3)3Sb2ClXI9–X leads to high-quality perovskite with two-dimensional layered phase favored for photovoltaics. The resulting lead-free perovskite solar cells reach a record-high power conversion efficiency over 2%.

Monolithic All-Perovskite Tandem Cell

  • We fabricated the world’s first monolithic all-perovskite tandem cell via developing a novel charge recombination layer. The tandems demonstrated high open-circuit voltages that almost equal to the sum of the two subcells.
  • J. Mater. Chem. A, 2016, 4, 1208–1213 (first author)

Ion Migration in 2D Halide Perovskites

  • We use scanning Kelvin prove microscopy to study ion migration in 2D halide perovskites under the effects of illumination and temperature . We found that ion migration varies with between purely-2D and methylammonium-incorporated quasi-2D perovskites

Colorful Perovskite Solar Cells

  • We, for the first time, report a simple and efficient strategy to achieve colorful perovskite solar cells by using the transparent conducting polymer PEDOT:PSS as a top electrode and simultaneously as an spectrally selective antireflection coating. Vivid colors across the visible spectrum are attained by engineering optical interference effects among the transparent PEDOT:PSS polymer electrode, the hole-transporting layer and the perovskite layer.
  • J. Mater. Chem. A, 2016, 4, 1208–1213 (first author)

High-Performance Nonfullerene Acceptors

  • We found that ZnO electron-transport layer tends to decompose high-performance acceptor-donar-acceptor (A-D-A) nonfullerene acceptors due to its photocatalytic activity under UV illumination. We developed a mitigation strategy by using SnO2 to replace ZnO, leading to better photovoltaic performance.


Research Interests

Our comprehensive suite of professional services caters to a diverse clientele, ranging from homeowners to commercial developers.

Emerging optoelectronic materials and devices

solar cells, LEDs, photodetectors etc

Advanced in-situ microscopy

to correlate nanoscale behavior with
device-level performance

to develop non-destructive metrology tools for Energy materials and optoelectronic devices

Collaborative Intelligence

machine learning and high-throughput screening guided materials & devices discovery