Nanoscale
·
2019
·Vol. 11
·期 32
·15083-15090
·
IF 6.97
Liming Liu,Xueping Yu,Zichuan Yi,Feng Chi,Honghang Wang,Yongfang Yuan,Dongliang Li,Kai Xu,Xiaowen Zhang
The solar-to-electric conversion efficiency of mesoscopic solar cells is highly dependent on electron extraction under solar irradiation and determines the charge recombination processes within devices. Boosting charge transfer via building energy level alignment has been proved to be a promising method to enhance the output power of solar cells. In the current work, we present the successful fabrication of functional biomass-converted carbon quantum dots with graded energy levels by doping nitrogen or sulphur atoms from lotus root powder. When employed as light absorbers for mesoscopic solar cells, light harvesting and electron extraction can be markedly increased arising from the band alignment of graded carbon quantum dots, yielding maximal power conversion efficiencies of 0.158% and 0.208% for bi- and tri-cascaded photovoltaics, respectively. The primary results demonstrate that the employment of an energy-graded architecture is a promising strategy to optimize the device output. Following this line of thought, we further fabricate a co-sensitized device by integrating graded carbon quantum dots with N719 dyes to enhance the electron extraction capability. The final device yields an efficiency as high as 9.04%, showing the potential application of carbon quantum dots in high-performance solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huanyu Zhang,Wenwu Liu,Rui Li,Mei Zhang,Min Guo
The substitution of toxic lead (Pb) in efficient perovskite solar cells (PSCs) is a key problem for commercialization. In this paper, strontium chloride (SrCl 2 )-doped lead-less PSCs were constructed successfully, and the effect of Sr substitution on the perovskite film formation and its photovoltaic property was investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible absorption, time-resolved photoluminescence (TRPL), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) analyses. It is demonstrated that the introduction of Sr substitution changes the chemical composition of PbI 2 precursors and reduces the excess PbI 2 in the perovskite films. A 10 mol% Sr substitution in the PbI 2 precursor solution can increase the absorbance of the resultant perovskite film and enhance the electron extraction at the “perovskite/TiO 2 ” interface, thus increasing the device's short-circuit current density ( J sc ) from 17.41 mA cm -2 to 19.45 mA cm -2 . At the same time, Sr substitution can reduce the charge combination in the PSC, which allows the PSC to obtain a higher open-circuit voltage ( V oc ) of 1.08 V and fill factor (FF) of 0.74. Finally, the PSC prepared with 10 mol% Sr substitution exhibits a considerable power conversion efficiency (PCE) of 15.64%, showing an improvement of 18.9% compared to that of the pristine device.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Riming Nie,Yangyang Wang,Weiwei Yuan,Chen Chen,Xianyu Deng
The performance of solar cells and photodetectors based on metal oxide/conjugated polymer hybrids was significantly enhanced by embedding fullerene (C60) in the metal oxide of TiO2. With the TiO2–C60 bulk composites as electron extraction layers, photodetectors based on poly(3-hexylthiophene) (P3HT)/TiO2–C60 hybrids exhibited the highest detectivity of 6.54 × 1012 jones at 520 nm and a fast response with the shortest rise time of 32 us. The key role of the C60 in the TiO2 layer is causing a fast electron transfer from defect state excitons to C60, resulting in the suppression of the recombination of the defect state excitons produced by a fluorescence (Föster) resonance energy transfer process from photoinduced P3HT excitons to the TiO2 defect states.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2013
·
IF 12.062
Shuxuan Qu,Minghua Li,Lixin Xie,Xiao Huang,Jinguo Yang,Nan Wang,Shangfeng Yang
A new graphene–fullerene composite (rGO-pyrene-PCBM), in which [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was attached onto reduced graphene oxide (rGO) via the noncovalent functionalization approach, was reported. The pyrene-PCBM moiety was synthesized via a facile esterification reaction, and pyrene was used as an anchoring bridge to link rGO and PCBM components. FTIR, UV–vis, and XPS spectroscopic characterizations were carried out to confirm the hybrid structure of rGO-pyrene-PCBM, and the composite formation is found to improve greatly the dispersity of rGO in DMF. The geometric configuration of rGO-pyrene-PCBM was studied by Raman, SEM, and AFM analyses, suggesting that the C60 moiety is far from the graphene sheet and is bridged with the graphene sheet via the pyrene anchor. Finally rGO-pyrene-PCBM was successfully applied as electron extraction layer for P3HT:PCBM bulk heterojunction polymer solar cell (BHJ-PSC) devices, affording a PCE of 3.89%, which is enhanced by ca. 15% compared to that of the reference device without electron extraction layer (3.39%). Contrarily, the comparative devices incorporating the rGO or pyrene-PCBM component as electron extraction layer showed dramatically decreased PCE, indicating the importance of composite formation between rGO and pyrene-PCBM components for its electron extraction property.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
EcoMat
·
2022
·Vol. 5
·期 4
·e12318
·
IF 12.213
Junjie Wen,Rui Lin,Yibing Wu,Hong Zhang,Hui Zhou,Zheng Liu,Yu Xie,Dapeng Ye,Xinhua Ouyang
Realizing environmental compatibility and high power conversion efficiency (PCE) are crucial in the research of organic photovoltaics towards practical application. Applying environmentally friendly bio-materials into the modification of cathode interlayer (CIL) is a feasible approach to move towards both targets. In this research, three edible bio-acids, ursolic acid, citric acid, and malic acid, are employed to modify the PDIN CIL of the organic solar cells (OSCs) with non-fullerene acceptors. Among these edible bio-acid modifiers, ursolic acid shows its excellent performance in improving interfacial contact and suppressing charge recombination. It helps to obtain a good interfacial contact and facilitates the electron extraction. As a result, the photovoltaic performance is significantly improved. The average PCE are increased from 17.58% of the control devices to 18.35% of the PDIN + Ursolic Acid based devices, with a maximum PCE of 18.54%. It is the champion efficiency among the reported applications of bio-derived materials for the CILs. This study demonstrates the successful application of edible bio-acid, which offers an effective and green approach for the CIL modification to realize highly efficient OSCs.
研究领域:
材料科学
·
环境科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 8
·6057-6063
·
IF 4.123
Xiang Fang,Jianning Ding,Ningyi Yuan,Peng Sun,Minghang Lv,Guqiao Ding,Chong Zhu
Organic–inorganic halide perovskites have emerged as attractive materials for use in photovoltaic cells. Owing to the existence of dangling bonds at the grain boundaries between perovskite crystals, minimizing the charge recombination at the surface or grain boundaries by passivating these trap states has been identified to be one of the most important strategies for further optimization of device performance. Previous reports have mainly focused on surface passivation by inserting special materials such as graphene or fullerene between the electron transfer layer and the perovskite film. Here, we report an enhanced efficiency of mesoscopic perovskite solar cells by using graphene quantum dots (GQDs) to passivate the grain boundaries of CH3NH3PbI3. The highest efficiency (17.62%) is achieved via decoration with 7% GQDs, which is an 8.2% enhancement with respect to a pure perovskite based device. Various analyses including electrochemical impedance spectroscopy, time-resolved photoluminescence decay and open-circuit voltage decay measurements are employed in investigating the mechanism behind the improvement in device performance. The findings reveal two important roles played by GQDs in promoting the performance of perovskite solar cells – that GQDs are conducive to facilitating electron extraction and can effectively passivate the electron traps at the perovskite grain boundaries.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Li Ping Liao,Yan Qing Yao,Gang Wang,Cun Yun Xu,De Bei Liu,Guang Dong Zhou,Yuan Xin Zhong,Qun Liang Song
Hot carriers in hybrid perovskite have been proven to have eminent properties with long carrier cooling time and long carrier migration distance. The invention of the internally photoemitted hot carrier (IPHC) solar cell recently makes it possible to utilize the hot electrons in CH 3 NH 3 PbI 3 perovskite and capture their excess energies under steady state illumination. How to further improve the efficiency of IPHC cells is challenging and crucial to demonstrate their effectiveness. In this work, sodium iodide (NaI) is added into the CH 3 NH 3 PbI 3 precursor solution for inducing a P-type doping and downshifting its Fermi level. The lowered energy barrier at the interface of Au/doped CH 3 NH 3 PbI 3 promotes the hot electron extraction, thereby enhancing the power conversion efficiency of IPHC devices. The FTO/TiO 2 /Au/Na + -doped MAPbI 3 construction with considerable photocurrent would be an alternative approach for light-to-electricity conversion.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 8
·4601-4609
·
IF 1.774
Zhang Xinxin,Zhang Jiejing,Su Pengyu,Feng Shuang,Xu Ri,Bian Chang,Fu Wuyou,Yang Haibin,Li Zhihui
Interfacial modification plays a vital role in boosting the performance of planar perovskite solar cells (PSCs). Here, perovskite-type BaTiO 3 nanocrystals prepared by immersing dense blocking TiO 2 (bl-TiO 2 ) in Ba(NO 3 ) 2 solution were used as an interfacial modifier. The interface bonding was improved due to the fact that BaTiO 3 and CH 3 NH 3 PbI 3 (MAPbI 3 ) have the same structure. Incorporation of BaTiO 3 nanocrystals effectively boosted the electron extraction rate and suppressed the carrier recombination at the interface. The MAPbI 3 grains nucleated and grew rapidly, resulting in larger grain size after introduction of BaTiO 3 nanocrystals. Photoluminescence (PL) spectroscopy, time-resolved PL decay spectroscopy, and electrochemical impedance spectroscopy measurements verified that the BaTiO 3 nanocrystals indeed promoted the carrier separation rate while suppressing nonradiative carrier recombination. By optimizing the bl-TiO 2 /MAPbI 3 interface, the power conversion efficiency of planar PSCs based on bl-TiO 2 /BaTiO 3 was improved from 15.03% to 17.71% [ J sc = 22.49 mA/cm 2 , V oc = 1.12 V, fill factor (FF) = 70%].
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
Joule
·
2025
·
IF 35.4
Qingbin Cai,Qin Tan,Jiacheng He,Siyuan Tang,Qiang Sun,Dong He,Tianle Cheng,Guoqiang Ma,Jinfeng Huang,Gangsen Su,Chuanxin Chen,Hao Gu,Bingzhe Wang,Jing Fan,Guichuan Xing,Zhubing He
Inverted perovskite solar cells without pre-depositing a layer of hole-transport materials (HTL-free PSCs) still suffer from the non-irradiative recombination at the perovskite/electron-transport layer (ETL) interface. In this work, we report a molecular complementary passivation (MCP) strategy by employing propylphosphonic acid 3-ammonium bromide (PPAABr) to cooperate with phenethylammonium bromide (PEABr) to mutually passivate surface defects of I and formamidinium (FA) vacancies by multi-coordination. This passivation led to an obvious decrease in interfacial defect-state density and greatly improved exciton and carrier lifetime for the perovskite film. Moreover, MCP surface treatment pushes the perovskite surface Fermi level closer to that of ETL, thereby enhancing interfacial electron extraction. As a result, MCP-based HTL-free PSC achieved a record efficiency of 26.40% (25.92% certified). The encapsulated device retains 94.8% of its initial efficiency after 1,000 h of light soaking. The generality of the MCP strategy also generated a competitive efficiency of 23.66% for 1.68 eV wide-band-gap PSCs.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hanhan Lv,Daniel K. Macharia,Lisha Zhang,Nuo Yu,Yi Zhang,Yumei Zhang,Zhigang Chen,Seeram Ramakrishna
The development of efficient photocatalysts for solar-driven hydrogen production is crucial for addressing energy and environmental challenges. Herein, a full-spectrum responsive “dual-engine” photocatalytic system based on a multifunctional cocatalyst featuring electrons extraction, photothermal heating effect and abundant active sites was successfully designed. In this system, hierarchical NiCo 2 S 4 (NCS)/defective ZnCdS (ZCS-Vs) composite photocatalysts were synthesized through a simple physical mixing method with hierarchical NCS modified ZCS-Vs nanoparticles. Owing to the introduction of black hierarchical NCS, these composite photocatalysts show a wide light absorption range from 300 to 1200 nm due to the introduction of black hierarchical NCS. Under broad-spectrum illumination, the optimized photocatalyst delivered a maximum H 2 production rate of 22.19 mmol·g −1 ·h −1 and an apparent quantum yield of 6.29 % at 420 nm, corresponding to roughly a 42-fold improvement over pure ZCS-Vs. This outstanding H 2 evolution performance originates from three key factors. First, the metallic nature and high work function of NCS enable the formation of a Schottky junction with ZCS-Vs, which efficiently extracts photogenerated electrons from ZCS-Vs for the reduction of H + ions. Second, under photoexcitation, NCS exhibits a strong localized surface plasmon resonance (LSPR) effect, leading to a rapid increase in local temperature on the catalyst surface. This localized heating further elevates the overall reaction solution temperature, thereby reducing the energy barrier for photocatalytic H 2 evolution. Third, 3D hierarchical structure of NCS not only inhibits nanoparticle aggregation and provides abundant active sites, but also enhances light harvesting through internal scattering, thereby maximizing both charge separation and photothermal efficiency. Consequently, this “dual-engine” photocatalytic system provides a feasible pathway for designing photothermal-assisted composite photocatalysts to enhance photocatalytic H 2 evolution efficiency.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Gong Cheng,Li Haiyun,Wang Huaxin,Zhang Cong,Zhuang Qixin,Wang Awen,Xu Zhiyuan,Cai Wensi,Li Ru,Li Xiong,Zang Zhigang
The bidirectional migration of halides and silver causes irreversible chemical corrosion to the electrodes and perovskite layer, affecting long-term operation stability of perovskite solar cells. Here we propose a silver coordination-induced n-doping of [6,6]-phenyl-C 61 -butyric acid methyl ester strategy to safeguard Ag electrode against corrosion and impede the migration of iodine within the PSCs. Meanwhile, the coordination between DCBP and silver induces n-doping in the PCBM layer, accelerating electron extraction from the perovskite layer. The resultant PSCs demonstrate an efficiency of 26.03% (certified 25.51%) with a minimal non-radiative voltage loss of 126 mV. The PCE of resulting devices retain 95% of their initial value after 2500 h of continuous maximum power point tracking under one-sun irradiation, and > 90% of their initial value even after 1500 h of accelerated aging at 85 °C and 85% relative humidity.
研究领域:
材料科学
·
光伏技术
·
太阳能
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Licheng Lou,Yuancai Gong,Jiazheng Zhou,Jinlin Wang,Xiao Xu,Kang Yin,Biwen Duan,Huijue Wu,Jiangjian Shi,Yanhong Luo,Dongmei Li,Hao Xin,Qingbo Meng
Photo-generated carrier recombination loss at the CZTSSe/CdS front interface is a key issue to the open-circuit voltage ( V OC ) deficit of Cu 2 ZnSnS x Se 4− x (CZTSSe) solar cells. Here, by the aid of an easy-handling spin-coating method, a thin PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) layer as an electron extraction layer has been introduced on the top of CdS buffer layer to modify CZTSSe/CdS/ZnO-ITO (In 2 O 3 :Sn) interfacial properties. Based on Sn 4+ /DMSO (dimethyl sulfoxide) solution system, a total-area efficiency of 12.87% with a V OC of 529 mV has been achieved. A comprehensive investigation on the influence of PCBM layer on carrier extraction, transportation and recombination processes has been carried out. It is found that the PCBM layer can smooth over the CdS film roughness, thus beneficial for a dense and flat window layer. Furthermore, this CZTSSe/CdS/PCBM heterostructure can accelerate carrier separation and extraction and block holes from the front interface as well, which is mainly ascribed to the downward band bending of the absorber and a widened space charge region. Our work provides a feasible way to improve the front interfacial property and the cell performance of CZTSSe solar cells by the aid of organic interfacial materials.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
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