IONICS
·
2022
·Vol. 28
·期 6
·3049-3056
·
IF 2.961
Xu Bozheng,Wang Liying,Li Xuesong,Yang Xijia,Lü Wei
While transparent photoanode is highly desired for energy devices, its performance is still far from expectation. In the present work, a facile strategy was developed to prepare transparent TiO 2 films as photoanodes of quantum dot–sensitized solar cells (QDSSCs). Different TiO 2 nanoparticles (P25, rutile, anatase) were dispersed in C 16 H 36 O 4 Ti included solution and spin-coated on FTO glass, which is followed by sintering. The as-prepared TiO 2 films were used as photoanodes of QDSSCs. It has been shown that QDSSCs assembled by TiO 2 film prepared by P25 and N-butyl titanate slurry achieved the best performance. The transparency could be controlled by coating times, and the three-layer TiO 2 film showed the best performance with 2.70% of power conversion efficiency. Our work simplified the preparation process of TiO 2 slurry, shortened the preparation time, and realized the control of the crystal type proportion ofTiO 2 . It provides a new method for preparing transparent TiO 2 thin film for QDSSCs.
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Danwen Yao,Zhenyu Hu,Liansheng Zheng,Shanming Chen,Wei Lü,Huailiang Xu
The research deals with fabrication of CdS/CdSe-sensitized quantum dot sensitized solar cells (QDSSCs) with laser-engineered black rutile TiO 2 nanoparticles (TiO 2 -NPs) as the photoanode material. Three QDSSC devices with pristine and two types of black rutile TiO 2 -NPs engineered respectively in water and ethanol by intense femtosecond laser propagating in the filamentation regime were prepared in the same architecture. Extremely different power conversion efficiencies (PCE) of 1.43 %, 3.68 % and 9.11 %, in which the black TiO 2 -NPs-based devices show respectively a two-fold and six-fold PCE higher than the pristine TiO 2 -NPs, were obtained. The absorption and electrochemical impedance spectroscopy analyses revealed that the device with the highest PCE has the highest absorption efficiency in the wide spectral range from UV to mid-infrared and shunt resistance ( R sh ) of 1364.9 Ω, but the smallest series resistance ( R s ) of 190.3 Ω, which are attributed to the surface modification on the structural and optical properties of TiO 2 -NPs by femtosecond laser pulses.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Han Song,Zhenxiao Pan,Huashang Rao,Xinhua Zhong
The time-consuming transport of photo-generated electrons across conventional photoanode film, composed of disordered P25 TiO 2 nanoparticulates, is one of the main bottlenecks to improve the performance of quantum dot-sensitized solar cells (QDSCs). A convenient and effective method was developed for the preparation of high performance photoanodes based on composite paste composed of conventional P25 TiO 2 nanoparticulates and TiO 2 hierarchical nanowires (HNW) for QDSCs. The shortened transport path in the composite photoanode brings forward suppressed charge recombination processes at the interfaces between photoanode and electrolyte, and improved photovoltaic performance of the resulting solar cells. Through optimizing the composite photoanode and the adoption of N-doped mesoporous carbon/Ti counter electrodes, average power conversion efficiency of Zn-Cu-In-Se (ZCISe) QDSCs was increased from 12.77% corresponding to conventional P25 photoanodes to 13.43% ( J sc = 27.38 mA cm −2 , V oc = 0.764 V, and FF = 0.642) corresponding to photoanodes with HNW/P25 weight ratio of 0.1%. Furthermore, this composite photoanode is also effective in improving the photovoltaic performance of QDSCs under different QD sensitizers (such as Zn-Cu-In-S (ZCIS) QDs) as well as different counter electrodes (such as Cu 2 S/brass).
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
DOI
高影响因子
NANO
·
2021
·
IF 1.556
Zhenyu Hu,Ruifeng Zheng,Wei Lü,Jialun Li,Xuesong Li,Yi Jiang,Xijia Yang,Liying Wang
While transparent solar cells are highly desired for smart energy devices, the general fabrication method is to sacrifice the film thickness of an electrode in exchange for a certain light transmittance, which limits the device performance. In this work, we developed a facile and economic strategy to prepare transparent TiO 2 films, which involved spin-coating n-butyl titanate on conductive FTO glass and sintering at suitable temperature. A transmittance up to ∼ 9 0 % in the visible and infrared range could be achieved. With the transparent TiO 2 film as photoanode of quantum dot sensitized solar cells, the highest power conversion efficiency was 2.92%. This work inspires new ways for the transparent electrode preparation of solar cells and provides a flexible and practical approach to anti-ultraviolet work, demonstrating its application potential in related fields.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Junhao Cai,Zeng Chen,Shengjun Li,Shaokang Dong,Chaochao Wei,Fumin Li,Yaru Peng,Xiyang Jia,Weifeng Zhang
This study reported the fabrication of hierarchical ZnO NS-NR-structured films by the assembly of ZnO NRs (NRs) on ZnO nanosheets (NSs) by a hydrothermal method . The morphology of the as-prepared ZnO NS-NR films was affected by several factors, such as the TiO 2 intermediate layer, the concentration of Zn(CH 3 COO) 2 in the seed precursor solution, and the hydrothermal reaction time. ZnO NRs were vertically grown on the ZnO NSs under specific conditions. Such ZnO NS-NR films exhibited considerably higher light-scattering ability compared with that of the ZnO NS films. Quantum dot (QD)-sensitized solar cells were assembled using the CdS/CdSe QDs co-sensitized ZnO NS-NR films as the photoanodes. The growth of the ZnO NRs led to the improvement in the short-circuit current density from 12.4 mA cm −2 to 15.1 mA cm −2 . A high power conversion efficiency of 6.0% was obtained with (NH 4 ) 2 TiF 6 treatment for 4 min.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Xiaobo Chen,Yefei Zhuang,Qingyu Shen,Xiaoyu Cao,Wen Yang,Peizhi Yang
Low electrocatalytic activity and/or high charge transfer resistance of counter electrodes (CEs) in quantum-dot-sensitized solar cells (QDSSCs) are the main reasons for the low photovoltaic performance . Herein, the CoS nanoparticles are anchored on the MXene (Ti 3 C 2 T x ) via a simple in-situ hydrothermal reaction process. It is the first attempt to use the MXene/CoS as a highly electrocatalytic CE for QDSSCs . The QDSSCs with a MXene/CoS CE shows a significant enhancement in cell performances and yields a promising power conversion efficiency (PCE) of 8.09% compared with that of the QDSSCs with bare CoS (5.77%) and bare MXene (4.25%) CEs. The significant enhancement of PCE value is mainly attributed to the synergistic effects of the unique layered morphology of conductive MXene nanosheets and its cocatalysis with CoS nanoparticles. The coupling of layered MXene with small CoS nanoparticles (~15 nm) provides abundant catalytic active sites. The improved mesoporous morphology contributes a high specific surface area and fast electron transfer channels for S x 2− reduction. Consequently, the MXene/CoS nanocomposite can be utilized as an effective agent to boost up the photovoltaic performance of QDSSCs.
研究领域:
材料科学
·
能源化学
·
纳米科技
·
光伏技术
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2013
·Vol. 8
·期 1
·1-7
·
IF 2.524
Hu Hongwei,Ding Jianning,Zhang Shuai,Li Yan,Bai Li,Yuan Ningyi
Ag 2 S quantum dots were deposited on the surface of TiO 2 nanorod arrays by a two-step photodeposition. The prepared TiO 2 nanorod arrays as well as the Ag 2 S deposited electrodes were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope, suggesting a large coverage of Ag 2 S quantum dots on the ordered TiO 2 nanorod arrays. UV–vis absorption spectra of Ag 2 S deposited electrodes show a broad absorption range of the visible light. The quantum dot-sensitized solar cells (QDSSCs) based on these electrodes were fabricated, and the photoelectrochemical properties were examined. A high photocurrent density of 10.25 mA/cm 2 with a conversion efficiency of 0.98% at AM 1.5 solar light of 100 mW/cm 2 was obtained with an optimal photodeposition time. The performance of the QDSSC at different incident light intensities was also investigated. The results display a better performance at a lower incident light level with a conversion efficiency of 1.25% at 47 mW/cm 2 .
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 29
·11416-11421
·
IF 8.262
Guocan Jiang,Zhenxiao Pan,Zhenwei Ren,Jun Du,Cheng Yang,Wenran Wang,Xinhua Zhong
Charge recombination losses are primarily responsible for the modest photovoltaic performance of quantum dot sensitized solar cells (QDSCs). Charge recombination occurring at the photoanode/electrolyte interface contributes significant energy loss in QDSC devices. Herein, a facile method to reduce the recombination loss by modifying the polysulfide electrolyte with the addition of poly(vinyl pyrrolidone) (PVP) as an efficient and general additive was introduced. It was found that the PVP modified polysulfide electrolyte could significantly improve the photovoltaic performance of QDSCs, especially the open-circuit voltage and fill factor. In addition, the PVP modified electrolyte is widely applicable to various QD sensitizer based systems. Impedance spectroscopy and open circuit voltage decay (OCVD) measurements reveal that the charge recombination processes occurring at the TiO2/QDs/electrolyte interfaces were remarkably inhibited using the PVP modified electrolyte. The average power conversion efficiency (PCE) was improved remarkably by 9% and a champion PCE of 9.77% was obtained with 20 wt% PVP in the polysulfide electrolyte for CdSexTe1−x based QDSCs. Moreover, the stability of the constructed QDSCs was also improved by employing the PVP modified polysulfide electrolyte.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Beilei Yuan,Qiqian Gao,Xueyu Zhang,Lianfeng Duan,Li Chen,Zhu Mao,Xuesong Li,Wei Lü
For improving the counter electrodes (CEs) quality of quantum dot-sensitized solar cells (QDSSCs), reduced graphene oxide (RGO)/Cu 2 S composite material has been prepared by a facile solvothermal method . The photovoltaic and electrochemical properties of the RGO/Cu 2 S CEs are investigated in detail. Compared with bare Cu 2 S CEs, the QDSSCs based on RGO/Cu 2 S composite electrodes display an apparent improvement in cell performances, the photovoltaic conversion efficiency (PCE) has been enhanced 51%. The QDSSCs with RGO/Cu 2 S CEs yield a PCE of 4.76% with short circuit current density (J sc ) of 17.10 mA cm −2 , open circuit voltage (V oc ) of 0.58 V and fill factor (FF) of 0.48. Present work demonstrates RGO/Cu 2 S composite could be a potential material for CEs of QDSSCs because of its excellent electrical conductivity, better catalytic activity, higher stability and smaller charge transfer resistance.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2018
·Vol. 6
·期 2
·025517
·
IF 1.151
Qingqing Pei,Zeng Chen,Shuo Wang,Di Zhang,Pin Ma,Shengjun Li
In this study, flexible CuxS-CNT/Ti counter electrodes (CEs) were prepared through successive ionic layer adsorption followed by reaction technique (SILAR). The electrocatalytic activities of the obtained CuxS-CNT/Ti CEs were investigated by electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. The results indicated that the catalytic activities of CNT/Ti films significantly improved after deposition of CuxS nanoparticles. CuxS-CNT/Ti flexible CEs were then assembled with CdS and CdSe QDs co-sensitized TiO2 film electrodes to prepare simple QDSCs. The optimized QDSCs based on CuxS-CNT/Ti flexible CEs delivered photovoltaic conversion efficiencies reaching ca. 6.20%. These values were ca. 48.7% higher than those based on CNT/Ti CEs.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 4
·H215
·
IF 3.259
Xiaohui Song,Jinfeng Wang,Xingna Liu,Menglin Xie,Yongyong Wang,Xiao Dong,Yong Yan,Congxin Xia
CuS nanoplate films were synthesized on FTO conducting glass substrates via a facile microwave-assisted hydrothermal (MHT) route and applied directly as a low-cost and high-efficiency counter electrode (CE) for liquid-junction quantum dot-sensitized solar cells (QDSSC). The two-dimensional structure of nanoplate provide high surface area for more active catalytic sites and easy accessibility for polysulfide electrolyte, which leads to the remarkable decrease in charge transfer resistance and the enhancement of catalytic activity of CE. As a result, the liquid-junction QDSSC assembled with the prepared CuS-2 CE achieves maximum power conversion efficiency (PCE) of 4.97%, which is superior than that of CuS fabricated by conventional chemical bath deposition method based cell (PCE 4.06%) and the 100 nm thin sputtered Pt/FTO CE based cell (PCE 3.08%). Furthermore, the prepared CuS exhibits highly chemical stability in polysulfide electrolyte, resulting in reproducible performance. These results show the potential application of MHT synthetic method in preparing metal chalcogenide CE for high-performance liquid-junction QDSSC in the future.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Xu Pei,Chang Xiaopeng,Liu Runru,Wang Liying,Li Xuesong,Zhang Xueyu,Yang Xijia,Wang Dejun,Lü Wei
Despite great efforts dedicated to enhance power conversion efficiency (PCE) of quantum dot-sensitized solar cells (QDSSCs) in the past two decades, the efficiency of QDSSCs is still far behind its theoretical value. The present approaches for improving PCE are mainly focused on tailoring the bandgap of QDs to broadening light-harvesting and optimizing interfaces of component parts. Herein, a new solar cell architecture is proposed by integrating concentrating solar cell (CPV) concept into QDSSCs with double photoanode design. The Cu 2 S mesh is used as a counter electrode and sandwiched between two photoanodes. This designed battery structure can increase the PCE by 260% compared with a single photoanode. With the most extensively used CdS/CdSe QD sensitizers, a champion PCE of 8.28% ( V oc = 0.629 V, J sc = 32.247 mA cm − 2) was achieved. This is mainly due to the increase in J sc due to the double photoanode design and adoption of the CPV concept. In addition, another reason is that concentrated sunshine illumination induced a photothermal effect, accelerating the preceding chemical reactions associated with the conversion of polysulfide species. The cell fabrication and design reported here provides a new insight for further development of QDSSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）