Topic research

Physics of Perovskite Solar Cells (Electrical properties, Hysteresis)

Transient Photovoltage and Photocurrent study (Circuit design and Interpretation) ​

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Experience gain

During my internship in Switzerland under the supervision of Prof. Dr. Wolfgang Tress at the Zurich University of Applied Sciences (ZHAW), I gained hands-on experience in the physics of perovskite solar cells (PSCs), particularly focusing on advanced characterization techniques. I investigated JV hysteresis with scan rate dependence and transient responses, exploring underlying mechanisms such as mobile ion migration, capacitive effects, and ion screening phenomena. My work also included temperature-dependent External Quantum Efficiency (EQE) measurements to probe the active layer's behavior and its impact on photovoltaic efficiency. Furthermore, I conducted electrochemical and optical transient studies using techniques such as Electrochemical Impedance Spectroscopy (EIS), Intensity-Modulated Photovoltage/Photocurrent Spectroscopy (IMVS/IMPS), and Transient Photocurrent/Photovoltage (TPC/TPV) analyses. These methods allowed me to explore charge carrier dynamics, recombination processes, capacitive behavior, and extract activation energies via Arrhenius analysis, deepening my understanding of PSC operational physics.

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During my internship in Switzerland, I had a chance to visit the Helmholtz-Zentrum Berlin (HZB) . I had the opportunity to engage with on-site research activities and learn from ongoing projects in the field of photovoltaics. I met with PJ, a Ph.D. internship student from our research groups working under the supervision of Prof. Dr. Eva Unger, and gained valuable insights into his research. The visit included observing HZB’s outdoor solar cell testing system, which inspired ideas for developing low-cost, field-deployable setup

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Impression

Wolfgang’s groups have a very deep understanding about Physics of Perovskite Solar Cells and group members also provide comprehensive study and developed advance characterization that can provide insight about PSCs behaviors including accurate PSCs simulation.

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I feel that Switzerland was a very nice place for me, full of nature, spectacular views and sceneric, good transportation services, a great university including people in academics, and a very nice city too. Only a negative impression that was a superb living-cost lol.