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Alexander R. Uhl
Researcher at University of Washington
Publications - 38
Citations - 4797
Alexander R. Uhl is an academic researcher from University of Washington. The author has contributed to research in topics: Copper indium gallium selenide solar cells & Thin film. The author has an hindex of 22, co-authored 35 publications receiving 3959 citations. Previous affiliations of Alexander R. Uhl include Uppsala University & Swiss Federal Laboratories for Materials Science and Technology.
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Journal ArticleDOI
Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells
Adrian Chirila,Patrick Reinhard,Fabian Pianezzi,P. Bloesch,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Debora Keller,Christina Gretener,Harald Hagendorfer,Dominik Jaeger,Rolf Erni,Shiro Nishiwaki,Stephan Buecheler,Ayodhya N. Tiwari +14 more
TL;DR: A new sequential post-deposition treatment of the CIGS layer with sodium and potassium fluoride is presented that enables fabrication of flexible photovoltaic devices with a remarkable conversion efficiency due to modified interface properties and mitigation of optical losses in the CdS buffer layer.
Journal ArticleDOI
Highly efficient Cu(In,Ga)Se2 solar cells grown on flexible polymer films
Adrian Chirila,Stephan Buecheler,Fabian Pianezzi,P. Bloesch,Christina Gretener,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Julian Perrenoud,S. Seyrling,R. Verma,Shiro Nishiwaki,Yaroslav E. Romanyuk,G. Bilger,Ayodhya N. Tiwari +14 more
TL;DR: A strong composition gradient in the absorber layer is identified as the main reason for inferior performance and it is shown that, by adjusting it appropriately, very high efficiencies can be obtained.
Journal ArticleDOI
Ultrahydrophobic 3D/2D fluoroarene bilayer-based water-resistant perovskite solar cells with efficiencies exceeding 22.
Yuhang Liu,Seckin Akin,Seckin Akin,Linfeng Pan,Ryusuke Uchida,Ryusuke Uchida,Neha Arora,Jovana V. Milić,Alexander Hinderhofer,Frank Schreiber,Alexander R. Uhl,Shaik M. Zakeeruddin,Anders Hagfeldt,M. Ibrahim Dar,Michael Grätzel +14 more
TL;DR: This new approach provides water- and heat-resistant operationally stable PSCs with a record-level PCE, and enhances interfacial hole extraction, suppressing nonradiative carrier recombination and enabling a power conversion efficiency (PCE) >22%, the highest reported for 3D/2D architectures.
Journal ArticleDOI
New-generation integrated devices based on dye-sensitized and perovskite solar cells
Sining Yun,Yong Qin,Alexander R. Uhl,Nick Vlachopoulos,Min Yin,Dongdong Li,Xiaogang Han,Anders Hagfeldt +7 more
TL;DR: In this paper, the authors provide an overview of state-of-the-art progress on the integrated solar cell devices based on DSSC and PSC, such as DSSCs/LIB, DSSc/PESC, PSC/PSC, SSC/SSC, OSC/SC, PSSC/SC/OSC, DSC/NG, NSC/NSC, PSC/NSCS, and PESC/ELC, for energy harvesting and storage.
Journal ArticleDOI
Atomic-level passivation mechanism of ammonium salts enabling highly efficient perovskite solar cells.
Essa A. Alharbi,Ahmed Y. Alyamani,Dominik J. Kubicki,Alexander R. Uhl,Alexander R. Uhl,Brennan J. Walder,Anwar Q. Alanazi,Jingshan Luo,Jingshan Luo,Andrés Burgos-Caminal,Abdulrahman M. Albadri,Hamad Albrithen,Hamad Albrithen,Mohammad Hayal Alotaibi,Jacques-E. Moser,Shaik M. Zakeeruddin,Fabrizio Giordano,Lyndon Emsley,Michael Grätzel +18 more
TL;DR: Alharbi et al. show that ammonium salts treatment can reduce the defect density at the perovskite surface and understand the passivation mechanism with 2D-solid state NMR.