Evaporated CdSe for Efficient Polycrystalline CdSeTe Thin-Film Solar Cells

Sabin Neupane, Deng-Bing Li, Manoj Jamarkattel, Abasi Abudulimu, Chun-Sheng Jiang, Sandip Bista, Alisha Adhikari, Sanjeeb Budhathoki, Hamim Sharif, Kiran Lamichhane, Tyler Brau, Adam Phillips, Ambalanath Shan, Randall Ellingson, Michael Heben, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

Abstract

Recent progress has shown that alloying cadmium telluride (CdTe) with cadmium selenide (CdSe) to create a CdSexTe1-x (CdSeTe) gradient region can significantly boost the performance of polycrystalline CdSeTe thin-film solar cells. However, improper CdSeTe alloying might introduce problematic band alignment and deleterious voids at the front interface, limiting the benefit maximization of this technique. Here, we show that the CdSe layers deposited by thermal evaporation result in CdSeTe cells with a higher performance than the sputtered CdSe. This is because evaporated CdSe can avoid the formation of voids at the front interface, producing improved front junction quality with suppressed front junction nonradiative recombination. The champion cell using evaporated CdSe demonstrated a power conversion efficiency (PCE) of 19.7%, much higher than 18.1% in the cell using sputtered CdSe.
Original languageAmerican English
Pages (from-to)6233-6237
Number of pages5
JournalACS Energy Letters
Volume9
Issue number12
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5K00-92554

Keywords

  • cadmium selenide
  • interfaces
  • layers
  • recombination
  • solar cells

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