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Band alignment and electrical characterizations of a grafted Si/MgCdTe p–i–n heterojunction.

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Názov: Band alignment and electrical characterizations of a grafted Si/MgCdTe p–i–n heterojunction.
Autori: Abbasi, Haris Naeem, Lu, Yi, Zhou, Jie, Qi, Xin, Ju, Zheng, Tsai, Tsung-Han, Liu, Dong, Nookala, Subramanya, Zhang, Yong-Hang, Ma, Zhenqiang
Zdroj: Journal of Applied Physics; 9/7/2025, Vol. 138 Issue 9, p1-8, 8p
Predmety: HETEROJUNCTIONS, SOLAR cells, CADMIUM telluride, BAND gaps, ABSORPTION coefficients
Abstrakt: Thin-film solar cells offer high power density and efficiency, making them attractive for terrestrial and space applications. Among these, cadmium telluride (CdTe) is a leading material due to its direct bandgap and high absorption coefficient. However, further improvements in efficiency and open-circuit voltage (Voc) are hindered by intrinsic p-type doping limitations, limiting the built-in potential (Vbi) and the corresponding Voc. To address this, we utilize semiconductor grafting to integrate a single-crystal p-type silicon nanomembrane onto an epitaxial MgCdTe layer, forming a Si/MgCdTe heterojunction while overcoming lattice mismatch constraints. Using x-ray photoelectron spectroscopy, we determine a type-I band alignment with conduction and valence band offsets of 0.66 and 0.45 eV, respectively. Additionally, we fabricate a p–i–n heterojunction diode, demonstrating a satisfying rectification ratio and a moderate ideality factor. This work provides a possible pathway for high-efficiency CdTe-based photovoltaics and Si/MgCdTe tandem cells, leveraging precise band alignment engineering and high p-type doping to enhance Voc in single junction cells and higher-efficiency multijunction cells. [ABSTRACT FROM AUTHOR]
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Databáza: Complementary Index
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Abstrakt:Thin-film solar cells offer high power density and efficiency, making them attractive for terrestrial and space applications. Among these, cadmium telluride (CdTe) is a leading material due to its direct bandgap and high absorption coefficient. However, further improvements in efficiency and open-circuit voltage (V<subscript>oc</subscript>) are hindered by intrinsic p-type doping limitations, limiting the built-in potential (V<subscript>bi</subscript>) and the corresponding V<subscript>oc</subscript>. To address this, we utilize semiconductor grafting to integrate a single-crystal p-type silicon nanomembrane onto an epitaxial MgCdTe layer, forming a Si/MgCdTe heterojunction while overcoming lattice mismatch constraints. Using x-ray photoelectron spectroscopy, we determine a type-I band alignment with conduction and valence band offsets of 0.66 and 0.45 eV, respectively. Additionally, we fabricate a p–i–n heterojunction diode, demonstrating a satisfying rectification ratio and a moderate ideality factor. This work provides a possible pathway for high-efficiency CdTe-based photovoltaics and Si/MgCdTe tandem cells, leveraging precise band alignment engineering and high p-type doping to enhance V<subscript>oc</subscript> in single junction cells and higher-efficiency multijunction cells. [ABSTRACT FROM AUTHOR]
ISSN:00218979
DOI:10.1063/5.0277928