Key Takeaways & Executive Findings
- •• CZTS-based heterojunction nanodevices were successfully fabricated for dual functionality as solar cells and self-powered photodetectors. • Rapid thermal processing (RTP) at 500 °C significantly improved crystallinity and surface morphology of CZTS films. • The photovoltaic device with 3-min CdS deposition achieved a power conversion efficiency of 1.15%, outperforming the 5-min counterpart (0.97%). • The fabricated devices exhibited self-powered photodetection capability, responding to wavelength-dependent light without external bias.
Abstract
CZTS (Cu2ZnSnS4) is a quaternary semiconductor that is environmentally friendly, less expensive. In this paper, we report on the optimization and fabrication of CZTS-based heterojunction nanodevices for bifunctional applications such as solar cells and photodetectors. CZTS thin films were deposited on top of (Molybdenum) Mo-coated glass substrates via RF sputtering at 100 and 200 W. Rapid thermal processing (RTP) was used at 300, 400, and 500 °C temperatures. CdS (cadmium sulphide) was deposited on CZTS using a chemical bath deposition system with 3- and 5-min deposition times. ZnO (zinc oxide) and AZO (aluminium doped zinc oxide) layers were deposited using RF (radio frequency) sputtering to create the solar device. XRD confirms the formation of a tetragonal structure with increased crystallinity due to the use of RTP. Raman reveals the characteristic Raman shift peak associated with CZTS at 336 and 335 cm−1. The FESEM shows a relationship with RTP temperature. Surface features, including grain size, vary with RTP temperature. The ideality factor is nearly 2, indicating imperfection in the Mo/CZTS interface. Schottky barrier height estimates range from 0.6 to 0.7 eV. Absorbance and transmittance show a predictable fluctuation with RTP temperature. Photovoltaic device was built using the higher crystalline feature of CZTS in conjunction with CdS deposited at 3 and 5 min. The efficiency of CdS deposited after 3 and 5 min was 1.15 and 0.97 percent, respectively. Fabricated devices were used for wavelength-dependent photodetection. This work demonstrated self-powered photodetection.
1. Introduction
Copper zinc tin sulfide (CZTS) thin film solar cells play an important role in the energy sector because of their potential for low-cost and sustainable photovoltaic technology. CZTS is composed of earth-abundant and non-toxic materials, making it an environmentally friendly alternative to conventional solar cell materials like cadmium telluride (CdTe) and copper indium gallium selenide (CIGS)[1−3]. CZTS's optimal bandgap of 1.5 eV, combined with a high absorption coefficient exceeding 10^4 cm−1, increases its efficiency in converting solar energy into electricity[4, 5].
Recent advancements in fabrication techniques, such as spray pyrolysis and magnetron sputtering, have increased the efficiency of CZTS solar cells, with reported efficiencies reaching up to 12.6%[6, 7]. Furthermore, integrating CZTS in tandem solar cells has shown promise in achieving higher efficiencies.
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Kalyan B. Chavan, Maruti V. Salve, Shweta Chaure, Nandu B. Chaure (2025). CZTS based novel bifunctional photovoltaic and self-powered photodetection nano system. SinoTechIntel Verified Research. https://doi.org/10.1088/1674-4926/25030025
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Frequently Asked Questions
What is the main objective of this research?
The research focuses on optimizing and fabricating CZTS-based heterojunction nanodevices that serve dual purposes: as solar cells and as self-powered photodetectors.
How were the CZTS thin films deposited?
CZTS thin films were deposited on Mo-coated glass substrates using RF sputtering at powers of 100 W and 200 W, followed by rapid thermal processing (RTP) at temperatures of 300, 400, and 500 °C.
What were the key results regarding photovoltaic performance?
The photovoltaic device with CdS deposited for 3 minutes achieved an efficiency of 1.15%, while the device with 5-minute CdS deposition had an efficiency of 0.97%.
Did the devices demonstrate photodetection capability?
Yes, the fabricated devices were used for wavelength-dependent photodetection and demonstrated self-powered operation, meaning they can detect light without an external power source.
What is the significance of the ideality factor and Schottky barrier height?
The ideality factor of nearly 2 indicates imperfections at the Mo/CZTS interface, and the Schottky barrier height was estimated to be between 0.6 and 0.7 eV, which are important for understanding device performance and interface quality.
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