NANOSCALE PHOTOVOLTAIC RESEARCH GROUP
Our group (PI: Dr Jae Sung Yun) established a unique setup to examine nanoscale optoelectronic properties of defects in semiconductors using scanning probe microscopy (SPM). In general, an SPM image is constructed by moving a sharp probe across a sample surface while using a feedback mechanism to maintain the tip−sample separation. As the probe is scanned along the surface, electronic, topographical, force, optical, and piezoresponse properties are mapped out at resolutions that range from the atomic scale up to tens of nanometres.
In order to reveal charge carrier transport properties, we utilise an external light source for Kelvin probe force microscopy, conductive AFM, piezoresponse force microscopy, Nano-IR microscopy, and electrostatic force microscopy.
Our group is particularly interested in elucidating the roles of nanoscale defects such as grain boundaries, twin or ferroic domains, and dislocations in emerging compound semiconductors for optoelectronic applications.
We investigate all kinds of energy harvesting materials, specifically but not limited to photovoltaic materials such as organic-inorganic metal halide perovskites, chalcogenides, kesterites, silicon, GaAs, etc. We are open to multidisciplinary collaboration opportunities!
GROUP NEWS
DEC 2023- Congratulations Nursultan for his work on halide segregation accepted in Advanced Materials. We revealed the Great job!
NOV 2023- Our work "Synergetic Effect of Aluminum Oxide and Organic Halide Salts on Two-Dimensional Perovskite Layer Formation and Stability Enhancement of Perovskite Solar Cells" has been selected as an inside front cover in Advanced Energy Materials.
OCT 2023- Our perovskite solar cells were tested at 35km high in Pisa!
AUG 2023- Collaboration work with KRICT has been accepted in Advanced Energy Materials.
JUL 2023-Dohyung's recent work on the nanoscale domain in halide perovskites is now published in JMCA.
JUL 2023- Our proposal on space PV international collaboration with Kyung Hee University, Kyungsang National University, and the Korean space testing centre has been successful! Check out the news.
AUG 2022- Prof. Martin Green visited Surrey and gave a talk on "Recent Progress in PV"
SEP 2022- Jihoo (PhD student) arrived in the UK, he will spend 1 year at Surrey and Oxford as a part of his PhD program. Welcome to Surrey Jihoo!
APR 2022- Eunyoung Choi (PhD student)'s work on the nanoscale investigation of 2D perovskite has been accepted in npj 2D Materials and Applications. Congratulation Eunyoung!
APR 2022- Jihoo Lim (PhD student)'s work on Cu induced degradation of halide perovskite has been accepted in ACS Materials and Interfaces. Congratulation Jihoo!
APR 2022- Dr Yun awarded Royal Society Grant on "Hydrogenation of halide perovskite solar cells"
FEB 2022- Eunyoung Choi (PhD student)'s abstract to MRS 2022 has been accepted as an oral presentation. Congratulations Eunyoung!
Interested in joining nanoscale PV research?
Please email j.yun@surrey.ac.uk or j.yun@unsw.edu.au
