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2022 PVSC Understanding the Behavior of Fixed Composition CdSeTe Solar cells.pdf (13.17 kB)
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Understanding the behavior of fixed composition CdSexTe1-x(CST) solar cells [Abstract]

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conference contribution
posted on 2023-01-06, 11:09 authored by Ebin Bastola, Adam B Phillips, Abasi Abudulium, Vlad KornienkoVlad Kornienko, Manoj K Jamarkattel, Zulkifl H Rabbani, Jared D Friedl, Prabodika N Kalurachchi, Ali AbbasAli Abbas, Abdul Quader, Xavier Mathew, Michael WallsMichael Walls, Randy J Ellingson, Michael J Heben

Cadmium selenide (CdSe) plays a vital role to achieving the high short-circuit current density (JSC ) and passivating the defects in the absorber layer for CdTe photovoltaics necessary to reach high efficiency. Incorporation of CdSe into devices can be done either by fabricating a CdSe/CdTe bilayer or directly depositing the CdSexTe1-x (CST). While the bilayer results in better device performance, the intrinsic properties of the CST suggest it should be the better absorber material. Here, we fabricated and investigated the structural and opto-electronic properties of fixed composition CST films for varying Se concentrations and report device parameters. The films were produced by leveraging our multisource evaporation chamber, allowing a wide range of Se compositions to be investigated without modification to the system. For fixed compositions CST absorber layers, the minority carrier lifetime is improved with higher Se content though the grain sizes are slightly smaller for higher Se content. Note that all these samples (pure CdTe and CST) have undergone same CdCl2 treatment. The device efficiency for fixed composition CST absorber layer observed is as high as 12.2% while for pure CdTe device (no Se) is 7%. The short circuit current density is high (28 mAcm−2 ), but CST devices suffer from low open circuit voltage (Voc) and fill factor (FF). For comparison, CdSe/CdTe bilayer devices also fabricated using this system were able to reach efficiency up to 17.7% (Voc 839 mV, Jsc 29.0 mAcm−2 , FF 72.6%), indicating the system produces good material. We will discuss the material properties of CST and correlate these values to the device performance.


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Engineering and Physical Sciences Research Council

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  • Mechanical, Electrical and Manufacturing Engineering

Research Unit

  • Centre for Renewable Energy Systems Technology (CREST)

Published in

2022 IEEE 49th Photovoltaics Specialists Conference (PVSC)


414 - 414


2022 IEEE 49th Photovoltaics Specialists Conference (PVSC)


Institute of Electrical and Electronics Engineers (IEEE)


  • AM (Accepted Manuscript)

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© 2022 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.

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Philadelphia, PA, USA

Event dates

5th June 2022 - 10th June 2022


Prof Michael Walls. Deposit date: 5 January 2023

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