Benign solution-processed (BixSb1−x)2Se3 alloys for short-wavelength infrared mesoporous solar cells

Jitendra Kumar, Omer Vana, Subila Kurukkal Balakrishnan, Eran Edri

Research output: Contribution to journalArticlepeer-review

Abstract

The short wavelength infrared (SWIR) region of the solar spectrum is underutilized, partly due to the limited availability of light absorbers for this region. Here, we report the synthesis of bismuth antimony selenide [(BixSb1−x)2Se3] alloys through a low-cost, low-temperature (310 °C) benign solution process. Twenty-three percent of Bi has been successfully incorporated in antimony selenide [Bi/(Bi + Sb) = 0.23], reducing the optical bandgap from 1.22 eV to 1.05 eV. A detailed study on the composition and structure of the (BixSb1−x)2Se3 deposits reveals that increasing the Bi ion content in the ink facilitated nucleation and growth in the solution, resulting in decreasing nanorods' diameter and length. The applicability of the developed method has been demonstrated by incorporating it in an FTO/ZnO/CdS/(BixSb1−x)2Se3/spiro-OMeTAD/Au solar cell structure. Developing benign solution processes for light absorbers in the SWIR region may enable low-cost tandem photovoltaics.

Original languageEnglish
Pages (from-to)11220-11231
Number of pages12
JournalJournal of Materials Chemistry C
Volume10
Issue number31
DOIs
StatePublished - 15 Jul 2022

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Chemistry

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