A
Alex K.-Y. Jen
Researcher at City University of Hong Kong
Publications - 973
Citations - 72195
Alex K.-Y. Jen is an academic researcher from City University of Hong Kong. The author has contributed to research in topics: Perovskite (structure) & Polymer. The author has an hindex of 128, co-authored 921 publications receiving 61811 citations. Previous affiliations of Alex K.-Y. Jen include University of Nebraska–Lincoln & Zhejiang California International NanoSystems Institute.
Papers
More filters
Journal ArticleDOI
Heterojunction Modification for Highly Efficient Organic–Inorganic Perovskite Solar Cells
Konrad Wojciechowski,Samuel D. Stranks,Antonio Abate,Golnaz Sadoughi,Aditya Sadhanala,Nikos Kopidakis,Garry Rumbles,Chang-Zhi Li,Richard H. Friend,Alex K.-Y. Jen,Henry J. Snaith +10 more
TL;DR: Through spectroscopic measurements, it is found that electron transfer from the perovskite to the TiO2 in the standard planar junction cells is very slow, so fullerene-modified devices achieve up to 17.3% power conversion efficiency with significantly reduced hysteresis, and stabilized power output reaching 15.7% in the planar p-i-n heterojunction solar cells measured under simulated AM 1.5 sunlight.
Journal ArticleDOI
High-Performance Perovskite-Polymer Hybrid Solar Cells via Electronic Coupling with Fullerene Monolayers
TL;DR: The C60SAM functionalization of mesoporous TiO2 is used to achieve an 11.7% perovskite-sensitized solar cell using Spiro-OMeTAD as a transparent hole transporter and this strategy allows a reduction of energy loss, while still employing a "mesoporous electron acceptor".
Journal ArticleDOI
Efficient CdSe/CdS quantum dot light-emitting diodes using a thermally polymerized hole transport layer.
Jialong Zhao,Julie A. Bardecker,Andrea M. Munro,Michelle S. Liu,Yu-Hua Niu,I-Kang Ding,Jingdong Luo,Baoquan Chen,Alex K.-Y. Jen,David S. Ginger +9 more
TL;DR: It is concluded that QD-LEDs could be made more efficient by further optimization of the organic semiconductors by using multiple spin-on HTLs.
Journal ArticleDOI
Polymer Solar Cells That Use Self‐Assembled‐Monolayer‐ Modified ZnO/Metals as Cathodes
TL;DR: In this paper, a thinbuffer layer of a conductive polymer, poly(3,4-ethylene-dioxylene thiophene):poly(styrene sulfonic acid) (PED-OT:PSS), is used to increase the work-function of ITO for effective hole collection.
Journal ArticleDOI
The role of spin in the kinetic control of recombination in organic photovoltaics
Akshay Rao,Philip C. Y. Chow,Simon Gélinas,Cody W. Schlenker,Chang-Zhi Li,Hin-Lap Yip,Alex K.-Y. Jen,David S. Ginger,Richard H. Friend +8 more
TL;DR: It is shown that the formation of triplet excitons can be the main loss mechanism in organic photovoltaic cells, and that, even when energetically favoured, the relaxation of 3CT states to T1 states can be strongly suppressed by wavefunction delocalization, allowing for the dissociation of 3 CT states back to free charges, thereby reducing recombination and enhancing device performance.