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Efficiency breakthrough for all-perovskite tandem solar cells

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Science China Chemistry 2020年第3期63卷 294-295页

作者： Tingming Jiang yang(michael)yang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310027China

The power conversion efficiency(PCE)of single-junction perovskite solar cells(PSCs)has rapidly boosted to 25.2%[1],approaching the Shockley-Queisser limit.A potential strategy to further elevate the PCE of single-junction PSCs is to fabricate all-perovskite tandem solar cells[2,3],which is composed of a wide-bandgap(1.7–1.9 eV)top sub-cell and a low-bandgap(0.9–1.2 eV)bottom sub-cell.

关键词： PCE Efficiency breakthrough for all-perovskite tandem solar cells

A Parameter–Free Generalized Moment Limiter for High-Order Methods on Unstructured Grids

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Advances in Applied Mathematics and Mechanics 2009年第4期1卷 451-480页

作者： michael yang Z.J.Wang Department of Aerospace Engineering and CFD Center Iowa State UniversityAmesIA 50011USA

A parameter-free limiting technique is developed for high-order unstructured-grid methods to capture discontinuities when solving hyperbolic conservation *** technique is based on a“troubled-cell”approach,in which cells requiring limiting are first marked,and then a limiter is applied to these marked cells.A parameter-free accuracy-preserving TVD marker based on the cell-averaged solutions and solution derivatives in a local stencil is compared to several other markers in the literature in identifying“troubled cells”.This marker is shown to be reliable and efficient to consistently mark the *** a compact highorder hierarchical moment limiter is developed for arbitrary unstructured *** limiter preserves a degree p polynomial on an arbitrary *** a result,the solution accuracy near smooth local extrema is *** results for the high-order spectral difference methods are provided to illustrate the accuracy,effectiveness,and robustness of the present limiting technique.

关键词： Limiter shock-capturing high-order unstructured grids

Dopant-free hole transporting materials with supramolecular interactions and reverse diffusion for efficient and modular p-i-n perovskite solar cells

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Science China Chemistry 2020年第7期63卷 987-996页

作者： Rongming Xue Moyao Zhang Deying Luo Weijie Chen Rui Zhu yang(michael)yang Yaowen Li Yongfang Li Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China State Key Laboratory fo r Artificial Microstructure and Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

The rational design of dopant-free organic hole-transporting layer(HTL) materials is still a challenge for realizing high-efficient and stable p-i-n planar perovskite solar cells(pero-SCs). Here, we synthesized two π-conjugated small-molecule HTL materials through tailoring the backbone and conjugated side chain to carefully control molecular conformation. The resultant BDT-TPAs Th containing a planar fused benzo[1,2-b:4,5-b′]dithiophene(BDT) core and a conjugated thiophene side chain showed the planar conformation. X-ray crystallography showed a favorable stacking model in solid states under the parallel-displaced π-πand additional S-π weak-bond supramolecular interactions, thus achieving an obviously increased hole mobility without *** an HTL material in p-i-n planar pero-SCs, the marginal solubility of BDT-TPA-s Th enabled inverse diffusion into the perovskite precursor solution for assisting the subsequent perovskite film growth and passivating the uncoordinated Pb2+ ion defects. As a result, the planar p-i-n pero-SCs exhibited a champion power conversion efficiency(PCE) of 20.5% and enhanced moisture stability. Importantly, the BDT-TPA-s Th HTL material also showed weak thickness-photovoltaic dependence, and the pero-SCs with blade-coated BDT-TPA-s Th as a HTL achieved a 15.30% PCE for the 1-cm2 modularized device. This HTL material design strategy is expected to pave the way toward high-performance, dopant-free and printing large-area planar p-i-n pero-SCs.

关键词： hole-transporting materials supramolecular interactions reverse diffusion p-i-n planar perovskite solar cells

Perovskite semiconductors for direct X-ray detection and imaging

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Journal of Semiconductors 2020年第5期41卷 34-43页

作者： Yirong Su Wenbo Ma yang(michael)yang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Halide perovskites have emerged as the next generation of optoelectronic materials and their remarkable performances have been attractive in the fields of solar cells,light-emitting diodes,photodetectors,*** addition,halide perovskites have been reported as an attractive new class of X-ray direct detecting materials recently,owning to the strong X-ray stopping capacity,excellent carrier transport,high sensitivity,and cost-effective ***,perovskite based direct Xray imagers have been successfully demonstrated as *** this review article,we firstly introduced some fundamental principles of direct X-ray detection and imaging,and summarized the advances of perovskite materials for these purposes and finally put forward some needful and feasible directions.

关键词： halide perovskites X-ray detection optoelectronic materials

Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators

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Light(Science & Applications) 2020年第1期9卷 947-956页

作者： Wenjuan Zhu Wenbo Ma Yirong Su Zeng Chen Xinya Chen Yaoguang Ma Lizhong Bai Wenge Xiao Tianyu Liu Haiming Zhu Xiaofeng Liu Huafeng Liu Xu Liu yang(michael)yang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhouZhejiangChina Center for Chemistry of High-Performance&Novel Materials department of ChemistryZhejiang UniversityHangzhouZhejiangChina

X-rays are widely used in probing inside information nondestructively,enabling broad applications in the medical radiography and electronic industries.X-ray imaging based on emerging lead halide perovskite scintillators has received extensive attention ***,the strong self-absorption,relatively low light yield and lead toxicity of these perovskites restrict their practical ***,we report a series of nontoxic double-perovskite scintillators of Cs_(2)Ag_(0.6)Na_(0.4)In_(1-y)Bi_(y)Cl_(6).By controlling the content of the heavy atom Bi^(3+),the X-ray absorption coefficient,radiative emission efficiency,light yield and light decay were manipulated to maximise the scintillator performance.A light yield of up to 39,000±7000 photons/MeV for Cs_(2)Ag_(0.6)Na_(0.4)In_(0.85)Bi_(0.15)Cl_(6) was obtained,which is much higher than that for the previously reported lead halide perovskite colloidal CsPbBr_(3)(21,000 photons/MeV).The large Stokes shift between the radioluminescence(RL)and absorption spectra benefiting from self-trapped excitons(STEs)led to a negligible selfabsorption *** the high light output and fast light decay of this scintillator,static X-ray imaging was attained under an extremely low dose of ∼1μGy_(air),and dynamic X-ray imaging of finger bending without a ghosting effect was demonstrated under a low-dose rate of 47.2μGy_(air) s^(−1).After thermal treatment at 85℃ for 50 h followed by X-ray irradiation for 50 h in ambient air,the scintillator performance in terms of the RL intensity and X-ray image quality remained almost *** results shed light on exploring highly competitive scintillators beyond the scope of lead halide perovskites,not only for avoiding toxicity but also for better performance.

关键词： perovskite absorption double

19.34 cm2 large-area quaternary organic photovoltaic module with 12.36% certified efficiency

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Photonics Research 2021年第3期9卷 324-330页

作者： Ziyan Jia Zeng Chen Xu Chen Jizhong Yao Buyi Yan Rui Sheng Haiming Zhu yang(michael)yang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China Center for Chemistry of High-Performance&Novel Materials Department of ChemistryZhejiang UniversityHangzhou 310058China Hangzhou Microquanta Semiconductor Inc. Hangzhou 311121China

In this study, a quaternary blending strategy was applied in the fabrication of organic photovoltaic devices and large-area modules. As a result, the ultimate quaternary organic solar cells(OSCs) deliver 16.71% efficiency for small-area devices and 13.25% for large-area(19.34 cm2) modules(certified as 12.36%), which is one of the highest efficiencies for organic solar modules to date. Our results have proved the synergistic effects of multiple components in OSCs, providing an effective strategy for achieving high-performance organic photovoltaic devices and modules.

关键词： quaternary synergistic strategy

Large-area perovskite solar cells

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Science Bulletin 2020年第11期65卷 872-875,M0003页

作者： Junliang yang Chuantian Zuo Yong Peng yang(michael)yang Xudong yang Liming Ding State Key Laboratory of Powder Metallurgy School of Physics and ElectronicsCentral South UniversityChangsha 410083China CSIRO Manufacturing Bag 10Clayton SouthVictoria 3169Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Perovskite solar cells(PSCs)have been attracting much attention during the past years due to the advantages of perovskite materials such as high light absorption coefficient,excellent charge mobility,long charge diffusion length,tunable direct band gap,low cost,etc.,exhibiting great potential as the next-generation photovoltaic technology[1–3].

关键词：钙钛矿太阳电池 attracting charge

Solution-processed halide perovskite microcavity exciton-polariton light-emitting diodes working at room temperature

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Photonics Research 2023年第10期11卷 1791-1801页

作者： TIANYU LIU PENG RAN YIRONG SU ZENG CHEN RENCHEN LAI WEIDONG SHEN YAOGUANG MA HAIMING ZHU yang(michael)yang State Key Laboratory of Modern Optical Instrumentation Institute for Advanced PhotonicsCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Excited State Materials of Zhejiang ProvinceDepartment of ChemistryZhejiang UniversityHangzhou 310027China Instrumentation and Service Center for Molecular Sciences Westlake UniversityHangzhou 310024China

Exciton-polaritons offer the potential to achieve electrically pumped perovskite polariton lasers with much lower current thresholds than conventional photonic lasers. While optically pumped exciton-polaritons have been widely studied in halide perovskites, electrically-pumped polaritons remain limited. In this study, we demonstrate the use of a solution-processing strategy to develop halide perovskite polariton light-emitting diodes(LEDs) that operate at room temperature. The strong coupling of excitons and cavity photons is confirmed through the dispersion relation from angle-resolved reflectivity, with a Rabi splitting energy of 64 meV. Our devices exhibit angle-resolved electroluminescence following the low polariton branch and achieve external quantum efficiencies of 1.7%, 3.85%, and 3.7% for detunings of 1.1,-77, and-128 meV, respectively. We also explore devices with higher efficiency of 5.37% and a narrower spectral bandwidth of 6.5 nm through the optimization of a top emitting electrode. Our work demonstrates, to our knowledge, the first room-temperature perovskite polariton LED with a typical vertical geometry and represents a significant step towards realizing electrically pumped perovskite polariton lasers.

关键词： pumped diodes tuning

FABRICATION OF DNA CHIPS FOR DIAGNOSTIC AND ENVIRONMENTAL APPLICATIONS

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FABRICATION OF DNA CHIPS FOR DIAGNOSTIC AND ENVIRONMENTAL AP...