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Embedding laser generated GaAs nanocrystals in perovskite wires for enhanced charge transport and photodetection

Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 83-89页

作者： Hang Guo Yu Tong Haibo Fan Qian Ye Jin Zhang Hongyue Wang Fengren Cao Liang Li Hongqiang Wang Instrumental Analysis Center Xi’an Jiaotong UniversityXi'an 710049China State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China School of Physics Northwest UniversityXi'an 710127China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Solution-processed perovskite wires are attractive candidates for photodetectors(PDs)due to their simple processibility as well as one-dimensional(1D)geometry with desirable charge carrier ***,the performance of the perovskite PDs is generally restricted by the charge carrier transport and extraction ***,we demonstrate that the charge transport and the consequent photodetection performance of MAPbI_(3)perovskite wires can be effectively enhanced by incorporating nanocrystals(NCs)of GaAs-a semiconductor with high charge carrier *** advantage of the pulsed laser irradiation technique,we successfully fabricate ligand-free GaAs NCs with a size of~7 nm and homogeneously embed them in MAPbI_(3) perovskite wires through a simple solution-processed synthesis *** with the pristine perovskite wires,the GaAs NCs modulated perovskite wires show improved charge carrier transport with the mobility rising from 1.13 to 3.67 cm^(2)V^(-1)s^(-1),and the resultant PD shows significant improvement in responsivity and *** study provides a new strategy for improving optoelectronic properties of halide perovskite materials and optimizing the device performance.

关键词： GaAs nanocrystals pulsed laser irradiation perovskite wires charge carrier transport photodetector

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Improved efficiency of ternary the blend polymer solar cells by doping a narrow band gap polymer material

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Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 59-63页

作者： ZHU XiXiang AN QiaoShi HUANG Hui JIAO ChaoQun ZHANG FuJun Key Laboratory of Luminescence and Optical Information Ministry of Education Beijing Jiaotong University School of Electrical Engineering Beijing Jiaotong University

A series of P3HT：PC71BM polymer solar cells （PSCs） with different PIDTDTQx doping concentrations were fabricated to in- vestigate the effect of the PIDTDTQx as a complementary electron donor on the performance of PSCs. The power conversion efficiency （PCE） of the optimized ternary blend PSCs （with 2 wt% PIDTDTQx） reached 3.87%, which is 28% higher than that of the PSCs based on P3HT：PCvlBM （control cells）. The short-circuit current density （J^c） was increased to 10.20 mA/cm2 compared with the control cells. The PCE improvement could be attributed to more photon harvest and charge carrier transport by appropriate doping PIDTDTQx. The energy transfer from P3HT to PIDTDTQx was demonstrated from the 650 nm emis- sion intensity decrease and the red-shifted emission peaks from 725 nm to 737 nm along with the increase of PIDTDTQx dop- ing concentrations.

关键词： ternary blend polymer solar cells exciton dissociation charge carrier transport

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Organic Photovoltaic Cells with Improved Performance Using Bathophenanthroline as a Buffer Layer

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Chinese Journal of Chemical Physics 2010年第1期23卷 84-88,I0002页

作者：王娜娜于军胜林慧蒋亚东电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室成都610054

The role of bathophenanthroline （Bphen） as a buffer layer inserted between fullerene （C60） and Ag cathode in organic photovoltaic （OPV） cell was discussed. By introducing Bphen as a buffer layer with thicknes from 0 to 2.5 nm, the power conversion efficiency of the OPV cell based on copper phthalocyanine （CuPc） and C60 was increased from 0.87% to 2.25% under AM 1.5 solar illumination at an intensity of 100 mW/cm^2, which was higher than that of bathocuproine used as a buffer layer. The photocurrent-voltage characteristics showed that Bphen effectively improves electron transport through C60 layer into Ag electrode and leads to balance charge carrier transport capability. The influence of Bphen thickness on OPV cells was also investigated. Furthermore, the absorption spectrum shows that an additional Bphen layer enhances the light harvest capability of CuPc/C60.

关键词： Organic photovoltaic cell Buffer layer Bathophenanthroline charge carrier transport

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Tail states suppression via surface-modification of wide-bandgap perovskites for high-efficiency all-perovskite photovoltaic tandems

Tail states suppression via surface-modification of wide-ban...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Guojia Fang Xuzhi Hu School of Electronic and Electrical Engineering Wuhan Textile University

As an essential light-absorbing material in perovskite-based tandem solar cells,widebandgap（WBG） perovskite has garnered extensive ***,due to severe non-radiative recombination from tail states,as well as photoinduced phase segregation and unoptimized charge transfer,WBG perovskite solar cells（PSCs） typically display significant open-circuit voltage（VOC） loss and low fill factor（FF）.In this work,we report to modify the 1.68 eV WBG perovskite film upon optimized surface passivation with 1,3-propanediammonium iodide（PDAI）.Time-resolved microwave conductivity measurement is employed to analyze the tail states,mobilities of charge carriers and the rate constants of recombination in perovskite *** results indicate that the optimized surface modification strategy not only enhances film quality,boosts carrier transport,but also suppresses tail states and therefore diminishes non-radiative recombination,consequently elevating the VOC and FF of the ***,the PDAI-assisted WBG PSCs deliver an optimal efficiency of 21.48 %,accompanied by a V of 1.243 ***,the integration of a narrow-bandgap tin–lead PSC with a semi-transparent WBG PSC results in a four-terminal perovskite/perovskite tandem solar cell,showcasing an efficiency surpassing 28 %.Our research offers a practical approach for producing efficient WBG PSCs and tandem solar cells.

关键词： Perovskite solar cell Tandem Wide bandgap charge carrier transport

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