JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Guoshuai Wang,Huiyun Wei,Yanhong Luo,Huijue Wu,Dongmei Li,Xinhua Zhong,Qingbo Meng
CdSe x Te 1−x alloyed colloidal quantum dots show great potential application on quantum dot-sensitized solar cells (QDSCs) due to its relatively wide light absorption range and high chemical stability. In this respect, a thin Mn modified CdSe layer is introduced into TiO 2 /CdSe x Te 1−x alloyed QDs surface via a simple chemical bath deposition method (CBD) in order to further improve the cell performance. The power conversion efficiency of CdSe x Te 1−x QDSCs has been improved to 8.14%. Detailed investigation on the influence of this modification toward the TiO 2 /CdSe x Te 1−x interface on the cell performance reveals that introduction of Mn into CdSe QDs is found to facilitate the Mn-doped CdSe deposition and improve the light absorption of the device. In the meantime, the existence of the (Mn-)CdSe layer can also work as a passivation layer to reduce charge recombination.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 7
·2200088
·
IF 9.173
Shoudeng Zhong,Zhuoxi Li,Chunqiu Zheng,Xinyi Luo,Jinwei Gao,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Although tin-based perovskite solar cells (TPSCs) are regarded as one of the most potential candidates in the field of lead-free photovoltaics, the photoelectrical properties of TPSCs are limited because Sn 2+ tends to be oxidized to be Sn 4+ to produce tin vacancies, resulting in poor performance. Herein, guanidine thiocyanate (GASCN) is selected to regulate the quality of tin-based perovskite film to fabricate efficient TPSCs. The device structure is ITO/PEDOT:PSS/PEA 0.1 FA 0.9 SnI 3 with or without GASCN/PCBM/PEI/Ag. The effects of GASCN additive on the microstructure and photoelectrical properties of TPSCs are systematically investigated. The results show that the GASCN additive can form Lewis adducts with uncoordinated Sn atoms, inhibit the oxidation of Sn 2+ to Sn 4+ , and passivate the trap states of perovskite films, resulting in the suppressed charge recombination and improved performance. Thus, the unsealed TPSCs with GASCN additive at the optimal process demonstrate a champion efficiency of 10.06% with better stability. Herein, an effective strategy to fabricate efficient and stable TPSCs is provided.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Chunfeng Mao,Yingjie Hu,Chenghan Yang,Chaochao Qin,Guomeng Dong,Yuming Zhou,Yiwei Zhang
Photocatalytic hydrogen evolution from water is an outstanding way to convert solar energy under the photocatalytic process. Unfortunately, traditional photocatalysts can not guarantee both the avoidance of charge recombination and the acceleration of electron transfer in hydrogen evolution reaction (HER). Therefore, it is a challenge to design catalysts for low charge recombination and fast electron transfer from a molecular perspective. Herein, covalent organic frameworks (COFs) with different rings such as a boric acid ring, nitrogen heterocyclic ring, and benzene ring were synthesized for the first time by changing the molecular structure. Importantly, COFs coupled to the benzene ring with a boric acid ring not only accelerate electron transfer by the conjugated system but also avoid electronic recombination because of the electron-deficient characteristics. The optimal HER was as high as 2789.46 μmol h–1·g–1. COFs are regulated at the molecular level by DFT calculation, which provides a method for the development of catalysts and analysis of the mechanism.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhurong Liang,Zhuoneng Bi,Kai Gao,Yifei Fu,Pengyue Guan,Xialei Feng,Zhisheng Chai,Gang Xu,Xueqing Xu
In common perovskite solar cells utilizing TiO 2 as electron transport layer, undesirable charge recombination at TiO 2 /CH 3 NH 3 PbI 3 interface is one of the crucial issues to the photovoltaic performance of the device. Moreover, exposure of TiO 2 under long-term solar illumination may also cause deep trap states at TiO 2 surface and seriously influence the device stability. Herein, we introduce an insulating ultra-thin Al 2 O 3 interfacial layer between the mesoporous TiO 2 film and perovskite layer. The power conversion efficiency of the solar cells fabricated via spray deposition in the air increased from 9.36% ( V oc = 0.86 V, J sc = 17.21 mA cm −2 , FF = 0.63) to 12.79% ( V oc = 0.93 V, J sc = 21.56 mA cm −2 , FF = 0.64). The significantly improved photovoltaic performance is mainly attributed to the efficient reduction of charge recombination. Meanwhile, the Al 2 O 3 -modified perovskite solar cells exhibit a strong stability under long-term light exposure compared with the common device without the Al 2 O 3 interfacial layer.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Ge Tang,Xiao-Hang He,Meng Liu,Hao Hao,Yi Liu,Feng-Lei Jiang
Due to the high surface-to-volume ratio of quantum dots (QDs), their surface ligands play a crucial role, especially in mediating energy and charge transfer processes. Short-chain ligands such as thiophenols with aromatic units have been commonly used as capping layers in quantum dot light-emitting diodes to enhance charge transport and charge injection. However, the impact of thiophenols on charge recombination in photophysical processes is not entirely clear. In this study, we systematically explored the effects of thiophenol derivatives with different substituents on the excited electron–hole recombination process in alloyed CdSeS QDs of high brightness (photoluminescence quantum yield ∼85%). Noteworthy, we observed that thiophenols quenched the photoluminescence (PL) of QDs (rich in Cd sites on the surface) and introduced a short lifetime decay channel caused by hole capturing. Meanwhile, the PL decay lifetime (τavg) of QDs was increased. Upon the addition of oleylamine (OAm), the PL intensity of the QDs was enhanced and τavg was decreased. These results indicated that the exposed Cd dangling bonds on the surface of QDs were passivated by OAm. Therefore, thiophenols unequivocally acted as hole acceptors while simultaneously causing more surface defect sites exposed on the surface of QDs, thereby limiting the radiative recombination of electrons and holes. These discoveries will have significant implications for the ligand engineering of QDs.
研究领域:
材料科学
·
纳米技术
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Xin Ding,Yan Gao,Ting Fan,Yongfei Ji,Linlin Zhang,Ze Yu,Mårten S.G Ahlquist,Licheng Sun
An efficient dye ( 1 ) sensitized photoelectrochemical cell (DS-PEC) has been assembled with a silicon compound (3-chloropropyl)trimethoxy-silane ( Si-Cl ) decorated working electrode (WE) TiO 2 ( 1 + 2 ). The introduction of this Si-Cl molecule on photoanode leads to better performances on efficiency than untreated ones for light driven water splitting. The firm Si-O layer formed on TiO 2 increased the resistance of the TiO 2 /catalyst interface which is assumed to decrease charge recombination from TiO 2 to the oxidized catalyst 2 . The work presented here provides an effective method to improve the performances of DS-PECs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Shibu Zhu,Xin Tian,Liming Shan,Zhaoying Ding,Zhengxing Kan,Xiaoling Xu,Zuowan Zhou,Li Wang
ZnO nanorod arrays were synthesized by an aqueous solution process with Al 3+ as an adjusting agent, and their performances as photoanodes of dye-sensitized solar cells (DSSC) were investigated. The ZnO nanorods were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It was found that adding Al 3+ during the growth procedure not only changed the morphology and aspect ratio but also affected the chemical features of the ZnO nanorods. The ZnO nanograss films were evaluated as photoanodes for DSSC. The photovoltaic results showed that the overall conversion efficiency of DSSC based on ZnO nanorods obtained from the growth solution containing 2 at% Al 3+ was increased by 55.6% as compared to that without Al 3+ . This significant improvement was attributed to the reduced charge recombination and enhancement of the electron lifetime.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·7799-7810
·
IF 2.779
Viswanathan Munusami,Arutselvan K.,Vadivel S.,Govindasamy S.
As a two-dimensional nanostructure, reduced graphene oxide (RGO) has high specific surface area and excellent conductivity. In this report, we obtain the BaSnO 3 /RGO via facile hydrothermal method and apply it as a photoanode material in dye-sensitized solar cells. A facile hydrothermal method is used to describe the synthesis of RGO hybridization of BaSnO 3 perovskite-type oxide nanopowder and its use as a photoanode replacement in dye-sensitized solar cells. Strutural, morphological, elemental composition and optical properties of the prepared samples were analyzed by X-ray diffraction, Raman, scanning electron microscope, energy dispersive spectra, transmission electron microscope, UV-Vis spectra, photoluminescence and X-ray photoelectron spectra analysis. RGO in the BaSnO 3 photoanode can inhibit charge recombination and thus improve the power conversion efficiency (PCE) of the DSSC. Moreover, the layered structure RGO increases the dye absorption in the BaSnO 3 photoanode and the light harvesting efficiency. As a result, JSC and PCE based on BaSnO 3 /RGO photoanode have considerably increased from 8.45 to 19.51 mA cm −2 , 3.41% to 9.88%. Based on the findings, BaSnO 3 /RGO photoanodes under easily reproducible scientific/rational approach will facilitate an astonishing possibility to enhancing the PCE which confidently reinforce the probability of implementation in practical life and is indispensable for balancing the future non-renewable energy dearth.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Manfang Mai,Lianke Ma,Yulan Zhou,Side Fu,Wenhao Deng,Xiaowen Wang,Xinzhou Ma
To overcome the rapid charge recombination and sluggish water oxidation kinetics, FeOOH/V O -BiVO 4 photoanodes were rationally prepared. The highest photocurrent density of 3.5 mA cm −2 was generated by the FeOOH/V O -BiVO 4 photoanodes at 1.23 V RHE , which was 3.5-fold higher than that of the pristine BiVO 4 . The dominate enhancement mechanism can be ascribed to significantly increased charge transfer efficiency by the FeOOH overlayers. Intensity-modulated photocurrent spectroscopy revealed that such increased charge transfer efficiency was resulted from the strong suppression of surface recombination by the FeOOH overlayers. Rate constant of surface recombination was strongly reduced to approximately 10 −2 s −1 at 0.93–1.23 V RHE . The strongly suppressed surface recombination was attributed to the storage capacity of the FeOOH for the photogenerated holes. Meanwhile, oxygen vacancies just had a minor impact on the kinetics of charge transfer and surface recombination but slightly increased the charge separation efficiency in the bulk. This work clarifies the roles of oxygen vacancies and the FeOOH overlayers in the increased photocurrent density, facilitating the rational design of high-performance BiVO 4 -based photoanodes.
研究领域:
光电化学
·
材料科学
·
水分解
·
半导体电极
·
光谱学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Rui Li,Xiangtao Huo,Xing Han,Zhipeng Wang,Mei Zhang,Min Guo
Reducing defect density and hindering charge recombination in perovskite film and at perovskite/semiconductor interface are crucial to perovskite solar cells (PSCs) performance. In this paper, hydrothermally prepared TiO 2 nanorod arrays (TNRAs) were coated with Nb 2 O 5 layer using a spin-coating method, and the modified TNRAs were used as scaffold for the deposition of perovskite films and corresponding PSCs in air environment. The effect of NbCl 5 concentration on the micro structure and photovoltaic properties of the formed perovskite films were investigated, and the enhancement mechanism was also elucidated. A champion efficiency of 16.50% (enhanced of 9.49% compared with the pristine one) was achieved when the concentration of NbCl 5 solution was 0.005 M. Such an enhanced performance of PSC might be mainly ascribed to two reasons: one was the improved perovskite film qualities including the enlarged average grain size, higher crystallinity and reduced defect density; the other was the formed energy barrier (Nb 2 O 5 ) between perovskite layer and TNRAs interface that hindered the charge recombination.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 12
·3167-3174
·
IF 3.975
Jing Ren,Qiang Luo,Qinzhi Hou,Hui Chen,Tao Liu,Hongcai He,Jinshu Wang,Qian Shao,Mengyao Dong,Shide Wu,Ning Wang,Jing Lin,Zhanhu Guo
Graphical Light it up : Retarding charge recombination and ultraviolet light irradiation degradation of lead-halide perovskite solar cells is highly desirable for their large-scale application. This work demonstrates that a SiO x interfacial layer inserted between the electron transporting layer and light-absorber layer passivates the trap states of lead-halide perovskite and simultaneously suppresses the charge recombination, resulting in an 18 % efficiency output of TiO 2 -based planar perovskite solar cells and improved light soaking stability under ultraviolet light irradiation. Organic-metal lead halide perovskite solar cells (PSCs) featuring low-cost and high efficiency have been recognized as promising photovoltaic devices, but their serious charge recombination and ultraviolet light irradiation instability limit their output efficiency and long-term operation. In this work, we have introduced silicon oxide as an interfacial modifier of the electron transporting layer in TiO 2 -based planar heterojunction PSCs. The incorporation of a silicon oxide modifier passivates the trap states of perovskite absorber and suppresses the charge recombination of PSCs. As a consequence, a competitive solar-to-electricity conversion efficiency of 18.0 % was achieved for the device fabricated with the silicon-oxide-modified TiO 2 electron extraction layer, which is increased by 15 % compared with the PSC fabricated with pristine TiO 2 ; this can be attributed to the significantly increased open-circuit voltage and photocurrent density. Furthermore, the ultraviolet light irradiation stability of PSCs is greatly improved, resulting from the low photocatalytic activity of the silicon-oxide-modified TiO 2 electron transporting layer, as revealed by the photoelectrochemical oxidation of CH 3 NH 2 . This work represents a feasible step through interfacial engineering toward the realization of ultraviolet-light-stable and scalable PSCs.
研究领域:
材料科学
·
光伏技术
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Qianqian Zhu,Xichang Bao,Jianhua Yu,Dangqiang Zhu,Meng Qiu,Renqiang Yang,Lifeng Dong
A high-mobility diketopyrrolopyrrole-based copolymer (P) was employed in compact layer free CH3NH3PbI3 perovskite solar cells as a hole-transporting layer (HTL). By using the P-HTL, the 6.62% device efficiency with conventional poly-3-hexylthiophene was increased to 10.80% in the simple device configuration (ITO/CH3NH3PbI3/HTL/MoO3/Ag). With improved short circuit current density, open circuit voltage, and fill factor, the higher power conversion efficiency of P-HTL device is ascribed to the higher carrier mobility, more suitable energy level, and lower interfacial charge recombination. Advantages of applying P-HTL to perovskite solar cells, such as low cost, low-temperature processing, and excellent performance with simple cell structure, exhibit a possibility for commercial applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）