OPTICAL MATERIALS
·
2021
·
IF 3.08
Jiaxiong Xu,Xiao Tian,Lei Qiu
Fluorine doped tin oxide (FTO) has low lattice mismatch with Cu 2 ZnSnS 4 (CZTS) thin film and has been considered as a suitable substrate material for CZTS. The interface properties between CZTS and FTO play an important role in the photovoltaic performance of CZTS thin film solar cells. However, studies on the properties of the CZTS/FTO interface are scarce. In this work, the phase structures, compositions, morphologies, and electrical contact properties of the CZTS/FTO interfaces were investigated. CZTS thin films with annealing temperature from 500 °C to 580 °C were deposited on FTO-coated glass substrate by sol-gel, spin-coating, and annealing processes. The CZTS/FTO interfaces were characterized by X-ray diffraction, Raman spectroscopy , energy-dispersive spectroscopy, secondary ion mass spectroscopy , scanning electron microscopy, resistivity, and current–voltage ( I – V ) characteristic curve measurement. The results show the successful formation of CZTS/FTO interfaces. No interfacial layer was found at all the CZTS/FTO interfaces, indicating the stability of the CZTS/FTO interface during high temperature treatment. The I – V curves of all the CZTS/FTO structures were near linear, revealing the formation of ohmic contact between CZTS and FTO. The experimental results in this work indicate the feasibility of FTO as a substrate and back electrode for CZTS thin films.
研究领域:
材料科学
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光伏技术
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薄膜太阳能电池
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1439
·
IF 5.719
Ying Yang,Yaya Ding,Jingyu Zhang,Nina Liang,Lizhen Long,Jun Liu
In this work, CZTS particles with a mixed phase of wurtzite and kesterite were synthesized by the solvothermal method. The time-dependent XRD patterns, Raman spectra, SEM, and EDS analysis were employed to study the growth mechanism of CZTS. The results revealed that the formation of CZTS started from the nucleation of monoclinic Cu7S4seeds, followed by the successive incorporation of Zn2+and Sn4+ions. Additionally, the diffusion of Zn2+into Cu7S4crystal lattice is much faster than that of Sn4+. With increasing time, CZTS undergoes a phase transformation from metastable wurtzite to steady kesterite. The morphology of CZTS tends to change from spherical-like to flower-like architecture. The mixed-phase CZTS with a bandgap of 1.5 eV exhibited strong visible light absorption, good capability for photoelectric conversion, and suitable band alignment, which makes it capable to produce H2production and degrade RhB under simulated solar illumination.Keywords:CZTS;wurtzite;kesterite;growth mechanism;photocatalytic performance
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 4
·4125-4131
·
IF 2.478
Zheng Han,Liu Ying
Cu 2 ZnSnS 4 (CZTS), with a direct bandgap of 1.5 eV, is a primary candidate material for solar energy conversion applied in both photovoltaics and photocatalysis due to its tremendous reserves and environmental friendly components. Though the utilization of CZTS with phases of kesterite and wurtzite are extensive, until now, the synthesis and growth procedure of both phases are not clearly understood. In this work, we succeed in synthesizing CZTS microspheres with controlled phase through a facile method—ultrasonic spray pyrolysis (USP). By choosing ammonium thioglycolate and l -cysteine as sulfur source, which were found to be the key factor in the phase formation process, CZTS microspheres can be prepared in kesterite phase and wurtzite phase, respectively. After exposing the prepared CZTS microspheres under the Xe lamp irradiation, we found an apparently phase-dependent photocatalytic hydrogen evolution, in which the performance of kesterite phase CZTS sample was almost 2 times as high as that of wurtzite CZTS sample.
研究领域:
材料科学
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能源转换
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Fan Yang,Ruixin Ma,Weishuang Zhao,Xiaoyong Zhang,Xiang Li
CZTS has been considered to be a perfect suitable replacement for CuInGaSe 2 (CIGS) which contains the rare elements. This work developed a novel route to fabricate CZTS absorber films based on the integration of non-vacuum and vacuum techniques. This was illustrated by first synthesizing CZTS powder with the method of solid-phase synthesis. Then three different compound targets made of CZTS precursors and pure CZTS powder were utilized to fabricate CZTS absorber films using Radio Frequency (RF) sputtering, followed by a sulfurization process. All synthesized samples were analyzed with respect to their crystal structure, vibrational property, morphology and chemical composition. The photoelectrical properties investigation of the sulfurized absorber films by UV-VIS spectrophotometer and Hall effect measurement can well meet the requirements for potential application in thin film solar cells, demonstrating this approach had great potential for CZTS solar cell production.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Qichen Zhao,Honglie Shen,Yajun Xu,Kai Gao,Dewen Chen,Yufang Li
Flexible CZTS solar cells have attracted significant attention in recent years owing to their high earth element composition and high photovoltaic conversion efficiency. However, these cells are associated with limitations common in compound thin-film solar cells, such as heterojunction interface combination centers, material defects, and energy level mismatch. In the current study, a green and simple solution spin-coating method is proposed for the preparation of flexible solar cells with multicycle CZTS/CCZTS absorber stacked structures to effectively circumvent the limitations of flexible devices. The results showed that the optimized Zn/Cd ratio results in CCZTS films with large grain longitudinal growth. However, lots of small broken grains were formed at the bottom of the absorber owing to the large lattice spacing, leading to the formation of cell leakage channels. The surface morphology of the absorber film was improved by preparing a stacked structure of CZTS and CCZTS with different periods while suppressing the longitudinal grain delamination. The stacked structure also helps to match the energy band of CZTS/CCZTS/CdS heterojunction. The top layer of CCZTS forms a buffered “energy band ladder” in the energy band of the CZTS/CdS heterojunction, thus suppressing the rapid carrier recombination caused by the Cliff-type energy band bending. A flexible solar cell was thus prepared to obtain a high photoelectric conversion efficiency of 6.51%, and the cells showed excellent resistance to mechanical bending.
研究领域:
材料科学
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光伏技术
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Maolin Mu,Wen Li,Lunyao Pan,Xiankan Zeng,Qungui Wang,Yongjian Chen,Chenglong Li,Di Shen,Xinning Wang,Shiyu Yang,Hongqiang Xin,Weiqing Yang
Achieving balanced charge injection and transport in perovskite light-emitting diodes (PeLEDs) remains challenging due to the large energy level offset between the indium tin oxide (ITO) electrode and the hole transport layer, coupled with an unsatisfactory hole injection capability. Given that Cu 2 ZnSnS 4 (CZTS) offers a deep valence band maximum, high hole mobility, high stability, and cost-effectiveness. Here, CZTS is introduced as a hole injection layer between the ITO and poly(9-vinylcarbazole) (PVK) layers to align energy level and increase hole injection capacity. The huge difference between CZTS and PVK work functions creates a robust interfacial electric field, resulting in an interfacial dipole effect, which significantly enhancing hole injection and boosting the carrier radiative recombination efficiency. Meanwhile, the robust CZTS/PVK interface favors high-quality FAPbBr 3 films with good morphology and reduced defects. The resulting optimized PeLEDs with a peak emission wavelength of 529 nm achieve an external quantum efficiency (EQE) of 15.44%, a turn-on voltage of 3 V and current efficiency (CE) of 75.3 cd A −1 , significantly outperforming the control devices, which exhibit an EQE of 7.55%, a turn-on voltage of 3.4 V and CE of 35.4 cd A −1 . This study provides novel insights into constructing efficient PeLEDs through enhanced hole injection using CZTS.
研究领域:
材料科学
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光电子学
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固体物理
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纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 48
·17531-17541
·
IF 7.393
Qichen Zhao,Honglie Shen,Kai Gao,Yajun Xu,Xuewen Wang,Yufang Li
Treating kesterite layers with sodium has been proved to be an effective way to improve the photovoltaic performance of Cu2ZnSnS4 (CZTS) solar cells. However, elemental diffusion effects inside the film and heterojunction energy band matching on the performance of flexible solar cells are rarely reported. In this work, flexible CZTS solar cells were doped with various sodium sources using a simple solution spin-coating post-treatment method. The research results demonstrated that films prepared by Na2S2O3 solution doping exhibit improved crystalline quality and photoelectric properties, while also inhibiting the growth of impurity defects within the films. Further optimization of the doping concentration of post-treatment solution showed that when the doping ratio was 0.05 mmol mL−1, the grain growth of the prepared film was larger, and adhesion between the film layers was enhanced. The energy band bending of the CZTS/CdS heterojunction exhibited a “cliff” arrangement when the conduction band offset (CBO) value was −0.34 eV, facilitating carrier transport in the space charge region and enhancing the collection of photogenerated carriers. The flexible CZTS solar cell constructed on this basis exhibited excellent bending resistance and a maximum photoelectric conversion efficiency (PCE) of 5.83% with an open-circuit voltage (Voc) of 609 mV.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 86
·70117-70126
·
IF 3.84
Bin Zhou,Donglin Xia,Youfa Wang
In this paper, we present a simple and feasible phase-selective synthetic approach to kesterite-phase and wurtzite-phase CZTS nanocrystals by controlling the concentration of sulfur and DDT. It is found that the sulfur precursor has an effect on the crystal phase formation and phase purity of the as-synthesized CZTS nanocrystals (NCs). With the increase of the amount of DDT substituted sulfur, CZTS NCs gradually evolve from kesterite-structure nanoplates to wurtzite-structure nanorods, and the as-synthesized CZTS NCs become smaller and more uniform. Time-dependent phase evolution results suggest that a small amount of DDT restrains the reactivity of the sulfur precursors, phase composition gradually evolves from Cu1.94S then to (ZnS)x(Cu2SnS3)1−x intermediate compounds and finally to kesterite CZTS NCs. Conversely, a small amount of S accelerates the decomposition of the DDT thiol group, which results in phase composition transformation from Cu1.94S then to (SnS)x(Cu2ZnS3)1−x intermediate compounds and finally to wurtzite CZTS NCs. The present study is a contribution towards understanding the phase-selective formation mechanism of CZTS nanocrystals, and provides a feasible approach to the synthesis of similar materials.
研究领域:
材料科学
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纳米技术
·
晶体生长
·
半导体材料
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DOI
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 21
·2400588
·
IF 6
Hongkun Liu,Yize Li,Aoqi Xu,Xinyu Li,Chunxu Xiang,Sifan Zhou,Shaoying Wang,Weibo Yan,Hao Xin
High-bandgap Cu 2 ZnSnS 4 (CZTS) thin film solar cells on transparent electrodes show favorable characteristics for new photovoltaic application scenarios including building-integrated photovoltaics, vehicle-integrated photovoltaics, and top cell for tandem structure. However, the efficiency of pure sulfide kesterite CZTS thin film solar cells on transparent substrates lags behind that on traditional Mo substrates. Herein, fabrication of high-quality CZTS absorber films and efficient solar cells on fluorine-doped tin oxide substrates from dimethyl sulfoxide solution is reported. The formation of harmful secondary phases in CZTS film is suppressed by simply adjusting the chemical stoichiometry in the precursor solution, leading to the development of 5.88% CZTS solar cells. Sodium (Na) doping further promotes grain growth and suppresses secondary phase, contributing to the reduced interface recombination and improved device performance. A champion device with an efficiency of 8.36% has been achieved with 1% Na doping, underscoring the significance of the solution process in achieving highly efficient kesterite solar cells on transparent electrodes.
研究领域:
光伏技术
·
材料科学
·
薄膜技术
·
可再生能源
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 53
·27805-27810
·
IF 3.708
Jing Wang,Peng Zhang,Xuefeng Song,Lian Gao
As a low cost and environment-friendly solar absorber material, Cu2ZnSnS4 (CZTS) has aroused great interest for both photovoltaic and photocatalytic applications. The development of low temperature and green chemical route for the preparation of this quaternary sulfide compound still remains a challenge. In the present study, we present a surfactant-free hydrothermal method for the preparation of CZTS nanocrystals with an average size of 12 nm and photoactivity in hydrogen production. Ammonia was proposed to play a key role in confining the particle sizes. The properties of the CZTS nanoparticles were characterized using XRD, Raman, XPS, TEM, and UV-vis absorption. The photocatalytic properties of the as-synthesized CZTS nanoparticles were tested both in thin films and in slurry systems.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shengchong Hui,Limin Zhang,Hongjing Wu
Vacancy engineering has been shown to be an effective way to tune the electromagnetic parameters of electromagnetic wave (EMW) absorbers and improve their absorption properties. However, the current methods to induce the formation of sulfur vacancies are not enough, and the contribution of sulfur vacancies to EMW absorption has not been clearly described. This work proposes a method to induce sulfur vacancies generation in the Cu 2 ZnSnS 4 (CZTS) system by cation doping. It is found that the formation of sulfur vacancies depends on reactivity with doping cations and the less reactive cation is more favorable for the formation of sulfur vacancies. Benefiting from the improved sulfur vacancies concentration, the defect-induced polarization and dipole polarization are greatly enhanced, which allows the EMW absorber to exhibit excellent EMW absorption performance. Therefore, the minimum reflection loss of the cation-doped CZTS reaches −61.80 dB at a thickness of 2.00 mm, and the effective absorption bandwidth reaches 6.29 GHz at 2.30 mm. This work not only expounds on the significant roles of sulfur vacancies in EMW absorption mechanism, but also presents a novel idea for defect construction of copper-based chalcogenide semiconductor materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2026
·
IF 2.6
Xiaojun Zhu,Fengxia Yang,Hao Sun,Xiaofei Dong,Yan Li
Memristors are key to brain-inspired neuromorphic computing, controllable modulation of volatile and non-volatile resistive switching characteristics is crucial for expanding their multi-functional applications. Herein, an Ag/CZTS-MoO 2 /Mo memristor is proposed, which exhibits bias-modulated transition between volatile and non-volatile resistive switching. Volatile switching behavior is observed at low bias (≤1.0 V), while stable non-volatile switching emerges at elevated biases (≥1.4 V) with an On/Off ratio of ∼10 3 . Moreover, the set voltage decreases from −0.70 V to −0.46 V as the bias voltage rises, accompanied by improved switching uniformity and stability. This phenomenon originates from the formation of more robust conductive filaments within the resistive switching layer under large applied bias. These findings demonstrate an effective strategy to modulate volatile and non-volatile switching based on CZTS, and highlight the great potential of CZTS for multifunctional memory and neuromorphic applications.
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产品关联
DOI
高影响因子
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