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CZTS solar cells and the possibility of increasing VOC using evaporated Al2O3 at the CZTS/CdS interface
摘要： We report the effect of an ultra-thin Al2O3 layer (down to 3 nm) as interface passivation strategy for the improvement of the performance of Cu2ZnSnS4/CdS based solar cells. After an initial optimization, the Al2O3 deposited by thermal evaporation is proved to improve the properties of the p-n junction. The fabricated devices showed an increment in Voc depending on the composition of the absorber, and an improvement in fill factor (FF) apparently related to the insulation of possible shunt-paths. Also, the impact on other optoelectronic parameters is discussed.
关键词： Al2O3,Interface passivation,Thermally evaporation,Cu2ZnSnS4 (CZTS)
更新于2025-09-23 15:19:57
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Growth of Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) thin films using short sulfurization periods
摘要： In this study CZTS thin films were grown by a two-stage process that involved sequential sputter deposition of metallic Cu, Zn, and Sn layers on Mo coated glass substrates followed by RTP annealing at 530 and 560 °C for various dwell times (1, 60, and 180 sec). CZTS thin films obtained by reaction at different sulfurization temperatures and reaction times were characterized employing XRD, Raman spectroscopy, SEM, EDX, and photoluminescence. It showed that extension of the sulfurization time provides better crystalline quality except for the CZTS560-60 thin film. SEM surface microstructure of the films displayed non-uniform, dense, and polycrystalline structure. The optical band gap of the films as determined by photoluminescence was found to be about 1.36-1.38 eV. It was observed that it is possible to obtain Cu-poor and Zn-rich CZTS thin films with short dwell time of reactions. XRD pattern and Raman spectra of the films showed formation of kesterite CZTS structure and some secondary phases such as CuS, SnS, SnS2. The full-width-at-half-maximum (FWHM) values extracted from the (112) diffraction peaks of the CZTS thin films.
关键词： Sulfurization time,Cu2ZnSnS4 (CZTS),Two-stage method,Sputtering,Sulfurization temperature,Kesterite
更新于2025-09-19 17:15:36
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An analysis of potential utilization of low cost Cu2ZnSnS4 thin film based photovoltaic in Sumbawa
摘要： Sumbawa has the potential to transition into a smart city, utilizing solar energy as their main source of its alternative energy. Located in the tropical country of Indonesia, Sumbawa’s dry season lasts eight months, during which it sees a solar intensity of 4.51 watt/m2/h, making solar energy a promising resource for the area. Its level of abundance and no pollution attribute are the main factors that make solar energy an attractive renewable resource. Raw calculation showed that solar energy is able to provide massive amount of energy, while solar panel and photovoltaic can produce zero greenhouse gases when converting solar energy into electricity. However, the high initial cost of installing solar cells hinder popularization of it as an alternative energy source, meanwhile some of the substance materials that compose solar panel may have a negative impact on the environment. This study intends to review the potential for inexpensive semiconductor-based solar panels to be applied as independent source of lighting by analysing the cost and environmental impact. Discussion on simple chemical method without high cost equipment instalment is also highlighted in this work, which offers recommendation of methods that can contribute on lowering the production cost of solar panel.
关键词： environmental friendly,solar cell,Cu2ZnSnS4 (CZTS),renewable and sustainable energy
更新于2025-09-16 10:30:52
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Origin of Band-Tail and Deep-Donor States in Cu <sub/>2</sub> ZnSnS <sub/>4</sub> Solar Cells and Their Suppression through Sn-Poor Composition
摘要： By comparing optical spectral results of both Sn-rich and Sn-poor Cu2ZnSnS4 (CZTS) with the previously calculated defect levels, we confirm that the band-tail states in CZTS originate from the high concentration of 2CuZn+SnZn defect clusters, whereas the deep-donor states originate from the high concentration of SnZn. In Sn-rich CZTS, the absorption, reflectance and photocurrent (PC) spectra show band-tail states that shrink the bandgap to only ~1.34 eV, while, photoluminescence (PL) and PC spectra consistently show that abundant CuZn+SnZn donor states produce a PL peak at ~1.17 eV and abundant SnZn deep donor states produce a PL peak near 0.85 eV. In contrast, Sn-poor CZTS shows neither bandgap shrinking nor any deep-donor-defect induced PL and PC signals. These results highlight that a Sn-poor composition is critical for the reduction of band-tailing effects and deep-donor defects and thus the overcoming of the severe open-circuit voltage (Voc) deficiency problem in CZTS solar cells.
关键词： Band-tail states,Deep defects,Cu2ZnSnS4 (CZTS),Optical characterization
更新于2025-09-12 10:27:22
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Structural and optical study of CZTS-reduced graphene oxide composite towards photovoltaic device application
摘要： The deficit in obtaining targeted photo conversion efficiency for (Cu2ZnSnS4) CZTS based photovoltaic cell results either from insufficient photo charge carrier generation or e-/h+ pair transportation towards the end of electrodes, which lowers the device Voc and Jsc. On this regard, semiconducting absorber material merged with highly mobile reduced graphene oxide (rGO) as filler form a bridging network within active layer facilitates both improvement in charge carrier separation as well as transportation to electrodes before recombination occurs. A simple solution casting approach for CZTS nanoparticle anchored rGO composite for photovoltaic device application is reported here. The presence and distribution of CZTS nanoparticles over the surface of rGO sheet is confirmed from XRD, Raman, SEM and UV-Visible analysis.
关键词： Raman,XRD,Cu2ZnSnS4 (CZTS),reduced graphene oxide (rGO),SEM,Photovoltaic device
更新于2025-09-12 10:27:22