Presentation Details
| CSS Grown CdSe Solar Cells for Tandem Applications Manoj K.Jamarkattel1, Adam B.Phillips1, Kiran Lamichhane1, Sam Machin2, Isuru Lakmal1, Sabin Neupane1, Sanjeeb Budhathoki1, Ujjwal Dhakal1, Alisha Adhikari1, Arun Basnet1, Tingting Zhu1, Tyler Brau1, Abasi Abudulimu1, Ebin Bastola1, Michael Walls2, Yanfa Yan1, Randy J.Ellingson1, Michael J.Heben1. 1Wright Center for Photovoltaic Innovation and Commercialization, University of Toledo, Department of, Toledo, OH, USA.2Centre for Renewable Energy Systems Technology (CREST), Loughborough University, Leicestersgire, United Kingdom |
Abstract
Cadmium Selenide (CdSe), with a bandgap of 1.7 eV, is an excellent candidate for top cell in tandem applications. We fabricated CdSe solar cells of varying thickness using a high-vacuum close-spaced sublimation (CSS) system and analyzed their properties. Cadmium chloride (CdCl2) treatment did not significantly alter surface morphology, bandgap, or crystal structure of the CdSe film. All as-deposited CdSe films displayed room-temperature photoluminescence (PL) emissions at around 1.7 eV, with no noticeable sub-bandgap emissions or selenium vacancy (VSe) defects. Following CdCl2 treatment, we observed an increase in sub-bandgap emissions. Low-temperature PL measurements showed a decrease in bandgap emission as well as in VSe-related emissions in thinner CdSe films. The device (SnO2/CdSe/PEDOT:PSS/CuSCN/Au) with a 1.5 µm CdSe absorber achieved an efficiency of 3.7%. Application of a suitable transparent electrode could further improve efficiency for tandem applications.
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