DYES AND PIGMENTS
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2018
·
IF 3.767
Han-Xuan Ji,Zu-Sheng Huang,Lingyun Wang,Derong Cao
Three novel metal-free organic dyes IT , IPT and IQT , containing a dipentyldithieno[3,2- f :2′,3′- h ]quinoxaline ( DPQ ) unit as the π-bridge were synthesized and the impacts of the auxiliary acceptors on the photovoltaic performances were studied. IQT with 2,3-dipentylquinoxaline as the auxiliary acceptor exhibited the highest efficiency of 7.98%, with a short-circuit photocurrent density of 16.87 mA cm −2 , an open-circuit photovoltage of 0.71 V, and a fill factor of 0.67, under standard global AM 1.5G solar light condition. IPT with the strongest electron-withdrawing group (2,3-dipentylpyridopyrazine) as the auxiliary acceptor could red-shift the absorption range, but showed the weakest performance, which might be due to the electron trap of the 2,3-dipentylpyridopyrazine unit. The results show that incorporating auxiliary acceptor with moderate electron-deficient ability can extend the absorption range and adjust the molecular orbital energy levels, improving the photovoltaic performance.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lu Chen,Jinxin Bian,Tiansheng Zhang,Xiaoyi Li,Ronghua Jian,Fan Wu
In this study, we employed lock-in amplifier-based surface photovoltage (SPV) spectroscopy to identify bandgap excitations, bound exciton states, and defect excitations in Cs 3 Bi 2 I 9 . This method, combined with SPV phase spectroscopy, enabled the evaluation of deep-level and shallow-level defects, correlating with charge-transfer transitions and defect-induced broad tailing absorption observed in the absorption spectrum. We found that deep-level defects in Cs 3 Bi 2 I 9 films can produce both positive and negative SPV signals, allowing for the simulation of excitatory and inhibitory synapses in neural networks and potential applications in robotic eye implants. By integrating Cs 3 Bi 2 I 9 thin films rich in deep-level defects, robotic eyes can generate execution and cancellation commands based on SPV responses to different light wavelengths. Our results demonstrate that defect states in Cs 3 Bi 2 I 9 are preparation-dependent, leading to broad tailing absorption and enabling the conversion of SPV signals via wavelength modulation. These results highlight the potential of Cs 3 Bi 2 I 9 in advanced optoelectronic applications.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-6
·
IF 14.919
Li Jidong,Long Yuyang,Hu Zhili,Niu Jiyuan,Xu Tiezhu,Yu Maolin,Li Baowen,Li Xuemei,Zhou Jianxin,Liu Yanpeng,Wang Cheng,Shen Laifa,Guo Wanlin,Yin Jun
External photo-stimuli on heterojunctions commonly induce an electric potential gradient across the interface therein, such as photovoltaic effect, giving rise to various present-day technical devices. In contrast, in-plane potential gradient along the interface has been rarely observed. Here we show that scanning a light beam can induce a persistent in-plane photoelectric voltage along, instead of across, silicon-water interfaces. It is attributed to the following movement of a charge packet in the vicinity of the silicon surface, whose formation is driven by the light-induced potential change across the capacitive interface and a high permittivity of water with large polarity. Other polar liquids and hydrogel on silicon also allow the generation of the in-plane photovoltage, which is, however, negligible for nonpolar liquids. Based on the finding, a portable silicon-hydrogel array has been constructed for detecting the shadow path of a moving Cubaris. Our study opens a window for silicon-based photoelectronics through introducing semiconductor-water interfaces.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Zhiqiang Deng,Rui Zhao,Tonghui Guo,Zequn Zhang,Yanjun Xing,Jing Zhang,Xiaohui Liu,Like Huang,Ziyang Hu,Yuejin Zhu
Inorganic nickel oxide (NiO x )-based inverted perovskite solar cells (PSCs) are reported to be more stable compared to those using organic hole transport layer materials. However, the Fermi level of NiO x is relatively away from the valence band of perovskite (PVK) layer, causing a large energy level shift at the NiO x /PVK interface and a weak built-in electric field strength . These increase the possibility of recombination, reduce the effective charge collection, seriously affect the efficiency of the device. In this work, an interface dipole with -CF 3 end group is anchored to the NiO x /PVK interface, leading to a more matched energy level structure and greatly reducing the energy barrier at the NiO x /PVK interface. Moreover, the addition of Si-CF 3 significantly improves the conductivity of NiO x and blunts the defects to large extent. The dipole interlayer significantly improves the built-in electric field and thus increases the photovoltage . Ultimately, the modified device achieves a score of 19.58% efficiency, much better than 17.98% of the control device.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Ziying Yuan,Yongyong Cao,Yue Meng,Guoxiang Pan,Yifan Zheng,Zheming Ni,Shengjie Xia
The built-in electric field of heterojunction can effectively promote carrier separation and transfer. While, its interface orientation is often random, leading to lattice mismatch and high resistance, thus limiting the efficiency of interfacial charge transfer. Herein, the lattice-matched heterojunction (CdS-Ag 2 S) was constructed by ion-exchange epitaxial growth . The results of surface photovoltage spectroscopy (SPV), transient photovoltage spectroscopy (TPV), and time-resolved photoluminescence (TRPL) show that the lattice-matched heterojunction has higher charge separation efficiency and longer photogenerated carrier lifetime than that of lattice-mismatched one. The lattice-matched CdS-Ag 2 S has a high built-in electric field (BIEF) value of 103.42 and a bulk-charge separation (BCS) efficiency of 68.71%, which is about three times higher than that of the lattice-mismatched heterojunction (CdS-Ag 2 S-M). In addition, the photodegradation efficiency of CdS-Ag 2 S towards norfloxacin (NOR) was also 3.4 times higher than that of CdS-Ag 2 S-M. The above results and density functional theory (DFT) calculations indicate that improving the lattice matching at the heterojunction is beneficial for establishing a high-intensity built-in electric field and effectively promoting bulk-charge separation efficiency, thus achieving excellent photocatalytic performance. This work provides an essential reference for the research of high-performance heterojunction photocatalysts.
研究领域:
材料科学
·
光催化
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Man Yang,Xueliang Zhu,Kangwei Mo,Sheng Li,Siyang Cheng,Yong Liu,Ning Yan,Zhiping Wang
Nickel oxide (NiOx), as an inorganic p-type semiconductor, has been widely adopted as hole-transporting layers in perovskite solar cells. Despite its superior material stability, the poor charge extraction and multi-vacancies greatly restrict the photovoltages and efficiencies. Here, we propose a facile method to tune the surface oxidation states of NiOx films by a lithium salt treatment for photovoltage enhancement. X-ray photoelectron spectroscopy measurement indicates that the lithium treatment only reduces the Ni3+ sites at the top region rather than in the bulk of NiOx films. This graded distribution allows more efficient charge extraction at the NiOx/perovskite interface as revealed by photoluminescence studies. Through a combination of capacitance–voltage and drive-level capacitance profiling measurements, we confirm enhanced built-in potentials and decreased interface defect densities in lithium-modified devices. Further modifying the interface with a self-assembly monolayer, the energy offsets at the interface can be largely reduced. Based on these enhanced properties, the modified devices achieve a high-power conversion efficiency of 22.4% (0.07 cm2) with a 120 mV enhancement in photovoltage in comparison with the untreated devices.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hong Chen,Yan Lei,Xiaogang Yang,Chaoliang Zhao,Zhi Zheng
The recombination of photoinduced charge carriers is detrimental to the photovoltaic performance of solar cells. In this work, we used CdS as an under-layer to reduce the recombination of photoinduced charge carriers at the Ag 2 S/FTO (F-doped SnO 2 ) interface. The CdS under-layer was deposited onto an FTO substrate using a facile chemical bath deposition (CBD) method. By controlling the thickness of the CdS film between Ag 2 S and FTO, the recombination of photoinduced charge carriers was successfully suppressed. The effect of the CdS under-layer on the charge carrier recombination was carefully evaluated by transient surface photovoltage (TSPV) measurements, electrochemical impedance spectroscopy (EIS) and a photoelectrochemical method. The power conversion efficiency (PCE) of solar cell devices with a 40 nm CdS under-layer is 1.16%, which is ~52% enhancement compared to those of FTO/Ag 2 S-based solar cell devices. Our work may provide a useful strategy to suppress photoinduced charge carrier recombination at the electrode and absorber semiconductor interface.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 4
·3174-3186
·
IF 2.993
Yuan Ling,Lu Shuangwei,Yang Feng,Wang Yushu,Jia Yongfang,Kadhim Mayameen S.,Yu Yanmei,Zhang Yong,Zhao Yong
Morphology is a crucial factor in determining the chemical, optical, and electrical properties of nanoscale materials. In this work, we utilized a facile room-temperature deposition method to synthesize three-dimensional (3D) coral-like Ag 2 S nanostructures. The formation mechanism of 3D coral-like Ag 2 S nanostructures was proposed by tracking the reaction process. In comparison with 0D Ag 2 S nanoparticles and 1D Ag 2 S nanowires of similar size, 3D coral-like Ag 2 S nanostructures exhibit higher pore volume, photocatalytic activity and cyclic stability for degradation of methyl orange (MO). Surface photovoltage measurement, electrochemical impedance spectroscopy, and Mott–Schottky analysis showed that compared to other Ag 2 S nanostructures, 3D coral-like Ag 2 S nanostructures have the strongest surface photovoltaic response, longest carrier lifetime, and highest carrier density.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Qingqing Qiu,Shuo Li,Jingjing Jiang,Dejun Wang,Yanhong Lin,Tengfeng Xie
The growth of anatase TiO2 nanowires (NWs) on fluorine doped tin oxide (FTO) substrates through hydrothermal reaction has attracted wide attention and research, especially in the case of the solar cells. Actually, the built-in electric field at the anatase TiO2 NWs/FTO interface leads to the photoexcited holes transfer to FTO conductive substrates because the Fermi energy of anatase TiO2 NWs film is higher than that of FTO substrates. Yet efficient transport of photoexcited electron to the FTO conductive substrates is desirable. Hence, the built-in electric field at the pure TiO2 NWs/FTO interface has prevented anatase TiO2 NWs-based solar cells from achieving a higher photoelectric performance. In this work, we elaborately design and construct the N-doped anatase TiO2 NWs/FTO interface with the desirable orientations from FTO toward N-doped anatase TiO2 NWs, which favors the photoexcited electron transfer to the FTO conductive substrates. The surface photovoltage (SPV) and Kelvin probe measurements demostrate that the N-doped anatase TiO2 NWs/FTO interface favors the photoexcited electron transfer to the FTO conductive substrates due to the fact that the orientation of the built-in electric field at the N-doped TiO2 NWs/FTO interface is from FTO toward TiO2. The photoexcited charge transfer dynamics of CdS QD-sensitized TiO2 NWs and N-doped TiO2 NWs electrodes was investigated using the transient photovoltage (TPV) and transient photocurrent (TPC) technique. Benefiting from the desirable interface electric field, CdS-based quantum dot-sensitized solar cells (QDSCs) with the optimal N doping amount exhibit a remarkable solar energy conversion efficiency of 2.75% under 1 sun illumination, which is 1.46 times enhancement as compared to the undoped reference solar cells. The results reveal that the N-doped anatase TiO2 NWs electrodes have promising applications in solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 16
·2207393
·
IF 13.3
Lina Hua,Liwei Tang,Yi Liu,Shiguo Han,Haojie Xu,Wuqian Guo,Yu Ma,Xitao Liu,Junhua Luo,Zhihua Sun
The bulk anomalous photovoltaic (BAPV) effect of acentric materials refers to a distinct concept from traditional semiconductor-based devices, of which the above-bandgap photovoltage hints at a promise for solar-energy conversion. However, it is still a challenge to exploit new BAPV-active systems due to the lacking of knowledge on the structural origin of this concept. BAPV effects in single crystals of a 2D lead-free double perovskite, (BBA) 2 CsAgBiBr 7 ( 1, BBA = 4-bromobenzylammonium ), tailored by mixing aromatic and alkali cations in the confined architecture to form electric polarization are acquired here. Strikingly, BAPV effects manifested by above-bandgap photovoltage ( V OC ) show unique attributes of directional anisotropy and positive dependence on electrode spacing. The driving source stems from orientations of the polar aromatic spacer and Cs + ion drift, being different from the known built-in asymmetry photovoltaic heterojunctions. As the first demonstration of the BAPV effect in the double perovskites, the results will enrich the family of environmentally green BAPV-active candidates and further facilitate their new optoelectronic application.
研究领域:
材料科学
·
光伏技术
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS TECHNOLOGY
·
2015
·
IF 1.227
Z. L. Zhang,M. L. Wang,Y. L. Mao
In this paper, heterojunction semiconductors of Sb-SnO2/TiO2 were prepared with varying molar ratios of Sb-SnO2 to TiO2. The separation efficiency of the photogenerated carriers was characterised by the surface photovoltage (SPV) technique, and the trap density was measured by an electrochemical method. The trap density was measured to be 7·48×1016, 6·01×1016, 5·43×1016, and 6·61×1016 cm−2 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The SPV enhancement was estimated to be 1, 1·36, 7·64, and 6·36 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The results indicate that SPV enhancement increases with decreasing trap density, which demonstrates that the trap density is an important factor affecting the separation efficiency of photogenerated carriers in heterojunction semiconductors.
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2018
·Vol. 62
·期 4
·519-526
·
IF 4.318
Zhang Busheng,Lei Yan,Qi Ruijuan,Yu Haili,Yang Xiaogang,Cai Tuo,Zheng Zhi
Both bismuth and copper are non-toxic and earth-abundant elements suitable for lead-free halide perovskite-like photovoltaic devices. Here, we report a highly facile route for in-situ producing copper-bismuth-iodide (CuBiI 4 ) thin films directly on ITO substrate at room temperature, by utilizing a Bi-Cu alloy layer as precursor. X-ray diffraction and transmission electron microscopy (TEM) results verified the formation of well crystallized CuBiI 4 thin films with [222] orientation. The transient photovoltage (TPV) analysis revealed that the CuBiI 4 is an n-type semiconductor with a suitable band gap of ~1.81 eV, preferable to photoelectric conversion compared with CH 3 NH 3 PbI 3 . It is very interesting that the subsequent spin-coating process of the classical Spiro-MeOTAD organic solution with TBP and acetonitrile resulted in a dense and smooth CuBiI 4 :Spiro-MeOTAD bulk-heterojunction film. The preliminarily fabricated simple sandwich structures of ITO/CuBiI 4 :Spiro-MeOTAD/Au hybrid solar cell devices displayed efficient photovoltaic performance with the PCE up to 1.119% of the best sample. The room temperature direct metal surface elemental reaction (DMSER) method may provide a new insight for all-inorganic lead free perovskite-like A a B b X x compounds and high performance photovoltaic devices.
研究领域:
材料科学
·
光伏技术
·
无机化学
·
半导体物理
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）