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Cadmium Selenide (CdSe) as an active absorber layer for solar cells with Voc approaching 750 mV

conference contribution
posted on 2024-01-04, 16:22 authored by Ebin Bastola, Adam B Phillips, Abasi Abudulium, Vlad KornienkoVlad Kornienko, Zulkifl Hussain, Manoj K Jamarkattel, Tamanna Mariam, Prabodika N Kalurachchi, Jared Friedl, Dipendra Pokhrel, Kara B Kile, Zhaoning Song, Yanfa Yan, Michael WallsMichael Walls, Randy J Ellingson, Michael J Heben

Cadmium Selenide (CdSe) is a semiconductor material with a band gap (1.74 eV) suitable for top cell for the fabrication of tandem devices. Here we explore the optoelectronic properties of evaporated CdSe and the subsequent device performance. The as-deposited CdSe film (thickness ∼800 nm) has small grains t ∼ 200–500 nm) that grow to the order of several microns after cadmium chloride (CdCl2) treatment. In addition, the CdCl2 treatment yielded enhanced photoluminescence (PL) response and long carrier lifetime. However, in addition to a significant band edge PL, we observe a wide peak at energies below the bandgap, suggesting defect states in the absorbance affecting the recombination in the device. The CdSe material was used as an active layer in photovoltaic devices (device structure SnO2/CdSe/HTLs/Au) and achieved a device efficiency of 2.6% with Voc exceeding 750 mV, FF of 56%, and Jsc of 6.1 mAcm-2 when illuminated through the thin Au (front) side. The device efficiency can be improved by replacing gold (Au, 10 nm) which has relatively poor transmittance and sheet resistance. We will discuss the comprehensive evaluation of CdSe films and devices for the photovoltaic application.

Funding

Doped emitters to unlock lowest cost solar electricity

Engineering and Physical Sciences Research Council

Find out more...

U.S. DOE’s office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO), Cadmium Telluride Accelerator Consortium (CTAC) (NREL Sub-contract SUB-2021-10715)

Air Force Research Laboratory under agreement number FA9453-19-C-1002

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Research Unit

  • Centre for Renewable Energy Systems Technology (CREST)

Published in

2023 IEEE 50th Photovoltaic Specialists Conference (PVSC)

Source

2023 IEEE 50th Photovoltaic Specialists Conference (PVSC)

Publisher

IEEE

Version

  • VoR (Version of Record)

Rights holder

© IEEE

Publisher statement

© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publication date

2023-12-25

Copyright date

2023

ISBN

9781665460590; 9781665460606

Language

  • en

Location

San Juan, PR, USA

Event dates

11th June 2023 - 16th June 2023

Depositor

Prof Michael Walls. Deposit date: 1 January 2024

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