MRS Meetings and Events

 

EN02.14.02 2023 MRS Spring Meeting

The Renaissance of Selenium Thin-Film Solar Cells – The Elemental High Bandgap Photoabsorber

When and Where

Apr 14, 2023
8:45am - 9:00am

Moscone West, Level 2, Room 2002

Presenter

Co-Author(s)

Rasmus Nielsen1,Tobias Hemmingsen1,Andrea Crovetto1,Ole Hansen1,Ib Chorkendorff1,Peter Vesborg1

Technical University of Denmark1

Abstract

Rasmus Nielsen1,Tobias Hemmingsen1,Andrea Crovetto1,Ole Hansen1,Ib Chorkendorff1,Peter Vesborg1

Technical University of Denmark1
In the pursuit of lowering the cost and increasing the penetration of solar energy technologies, a family of inorganic thin-film photovoltaic materials is emerging. The oldest member of this family, selenium, is experiencing renewed interest due to its high bandgap of 1.95 eV in its trigonal phase, as well as its irresistible monoatomic simplicity. The high bandgap makes selenium a potential partner in tandem photovoltaic devices featuring e.g., silicon as the lower bandgap photoabsorber, but high-efficiency selenium thin-film solar cells have yet to be realized.<br/>We present selenium thin-film solar cells with power conversion efficiencies exceeding 5% and following a novel optimization of the carrier-selective contacts, we demonstrate a record open-circuit voltage of 0.99V and highly encouraging fill-factors beyond 60%. These state-of-the-art devices are investigated in a combined experimental and first-principles study to reveal the origin of the still-significant photovoltaic losses [1]. In view of these results, we set forth strategies for continued improvements to the photovoltaic performance by means of non-equilibrium growth and defect engineering.<br/><br/>[1] Nielsen et al., J. Mater. Chem. A, (under review)

Keywords

physical vapor deposition (PVD)

Symposium Organizers

Eric Colegrove, National Renewable Energy Laboratory
Jessica de Wild, imec
Byungha Shin, Korea Advanced Institute of Science and Technology
Colin Wolden, Colorado School of Mines

Publishing Alliance

MRS publishes with Springer Nature