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Structural and Electronic Properties of Indium-Doped n-type Cd-Se-Te Crystals

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We present a comprehensive investigation into the potential of n-type indium-doped cadmium selenide telluride (CST:In) as a high-performance candidate for solar cell applications, without the need for resource-intensive post-growth treatments that are required for CdTe:In. We compared undoped CST and CST:In crystals under different growth conditions, analyzing their structural and electronic properties using x-ray diffraction (XRD), electron probe microanalysis (EPMA), current–voltage (IV) and Hall effect measurements, time-resolved photoluminescence (TRPL), optical transmission, and photoluminescence (PL) mapping. The results reveal that as-grown CST:In crystals achieve nearly 100% carrier activation, yielding an electron concentration of 9.5 × 1018 cm−3, mobility of 653 cm2/V·s and a 5 ns lifetime which approaches the radiative limit. Furthermore, comparison of PL maps from crystal growths having different cooling profiles suggests a strong effect of cooling rate on selenium segregation and cubic/hexagonal/polytype phase distribution. Slower cooling leads to a more homogeneous cubic structure with lower Se segregation, while a faster cooling rate results in increased Se segregation, and twin boundaries and stacking faults with polytypic and hexagonal character.

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This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office Award Numbers DE-EE0007537 and DE-EE0008548. The authors thank Scott Boroughs for assistance with the microprobe WDS, M. C. Dixon Wilkins for assistance with XRD, Santosh K. Swain for helping crystal growth, Dr. Matthew D. McCluskey for editing the paper, and Darius Kuciauskas for helping 2PE TRPL measurement.

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Jing Shang: Writing-draft, conceptualization, formal analysis. Magesh Murugesan: Crystal growth, annealing, writing-review, and editing. Rubi Gul: Hall and IV measurements. Samuel Bigbee-Hansen: Optical measurements. Joseph M. Tallan: XRD and EPMA. Joel Duenow: Conceptualization, writing-review and editing, Hall measurements, supervision, funding acquisition. John S. McCloy: Conceptualization, writing-draft, writing-review and editing, supervision, funding acquisition.

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Correspondence to John S. McCloy.

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Shang, J., Murugesan, M., Gul, R. et al. Structural and Electronic Properties of Indium-Doped n-type Cd-Se-Te Crystals. J. Electron. Mater. 53, 3848–3860 (2024).

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