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 new technology, innovation, and sustainability
I have made seminal contributions in new semiconductors with applications in optoelectronics and energy conversion. From the device integration aspect, I was the first to assemble monolithic all-perovskite tandem cell, a technology now considered as one of the most promising candidates for commercialization; I was the first to report perovskite solar cell reverse bias breakdown voltage comparable to silicon cell, suggesting that the “notorious” reverse bias instability in perovskite PV can be solved using traditional bypass diode configurations; From the microscopy techniques aspect, I successfully applied various (scanning probe, optical, and electron) microscopy techniques to study the fundamental semiconductor properties such as ion motion, phase segregation, and chemical passivation effects, and investigated their correlation with macroscopic film- and device- performance, ultimately demonstrating single-junction and/or perovskite tandems with record-high performance.
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 > 3000 total citations and a Google H-index of 29 (01/2025).
Selected Publications
Reverse Bias Stability
- 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)
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 & Photostability
- 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 Perovskites
- 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%.
Tandem
- 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
- 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 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)
Interlayer Optimization
- 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
Emerging semiconductors
Integrated on-chip electronics and systems: microLEDs, photo-/radiation- imaging, bioelectronics, quantum technology.
Energy conversion: solar cells.
Advanced Microscopy
Developing correlative microscopies to elucidate the fabrication-composition-property relationships of emerging semiconductors and devices.
Artificial Intelligence
Machine learning models trained on high-throughput microscopic features and macroscopic device performance will be adapted to denoise signals and understand complex correlations.
