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Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells

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Carbon Energy 2024年第5期6卷 164-174页

作者： Hyun-Seock Yang Danbi Kim Chang-Mok Oh Vellaiappillai Tamilavan Pesi MHangoma Hojun Yi Bo RLee Insoo Shin In-Wook Hwang Sung Heum Park Pukyong National University BusanRepublic of Korea Clarendon Laboratory University of OxfordOxfordUK Institute of Energy Transport and Fusion Research Pukyong National UniversityBusanRepublic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangjuRepublic of Korea Department of Chemical and Biomolecular Engineering Tandon School of EngineeringNew York UniversityBrooklynNew YorkUSA

Photoinduced intermolecular charge transfer(PICT)determines the voltage loss in bulk heterojunction(BHJ)organic photovoltaics(OPVs),and this voltage loss can be minimized by inducing efficient PICT,which requires energy-state matching between the donor and acceptor at the BHJ interfaces.Thus,both geometrically and energetically accessible delocalized state matching at the hot energy level is crucial for achieving efficient PICT.In this study,an effective method for quantifying the hot state matching of OPVs was developed.The degree of energy-state matching between the electron donor and acceptor at BHJ interfaces was quantified using a mismatching factor(MF)calculated from the modified optical density of the BHJ.Furthermore,the correlation between the open-circuit voltage(Voc)of the OPV device and energy-state matching at the BHJ interface was investigated using the calculated MF.The OPVs with small absolute MF values exhibited high Voc values.This result clearly indicates that the energy-state matching between the donor and acceptor is crucial for achieving a high Voc in OPVs.Because the MF indicates the degree of energy-state matching,which is a critical factor for suppressing energy loss,it can be used to estimate the Voc loss in OPVs.

关键词： bulk heterojunction open circuit voltage organic photovoltaics photoinduced charge transfer voltage loss

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Reducing the voltage loss of Y-series acceptor based organic solar cells via ternary/quaternary strategies

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Chinese Chemical Letters 2024年第2期35卷 70-86页

作者： Pengyu Zhang Zhiyang Zhang Heng Sun Jie Li Yi Chen Jiang Wang Chuanlang Zhan Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) of the Department of Education of Inner Mongolia Autonomous Region Inner Mongolia Key Laboratory of Green CatalysisCollege of Chemistry and Environment ScienceInner Mongolia Normal UniversityHuhehot 010022China

In recent years, with the emergence of non-fullerene fused-ring acceptors, power conversion efficiencies (PCEs) of organic solar cells (OSCs) have exceeded 19%.However, compared to inorganic or perovskite photovoltaic cells, a higher voltage loss has become one of the key factors limiting further improvement in the PCEs of OSCs.The ternary/quaternary strategy has been identified as a feasible and effective way to obtain high-efficiency OSCs.In this review, a brief outline is given of the key roles that guest materials played in reducing voltage losses in solar cell devices and a brief look at the future material design and the design of ternary/quaternary systems.

关键词： Organic solar cell Ternary/quaternary strategy Open-circuit voltage voltage loss Non-radiative recombination loss

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High Open-circuit voltage and Low voltage loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene)Acceptor

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Chinese Journal of Polymer Science 2020年第11期38卷 1157-1163,I0005页

作者： Han Han Fu-Jin Bai Rong Wei Han Yu Yi-Kun Guo He Yan Da-Hui Zhao Beijing National Laboratory for Molecular Sciences Centre for the Soft Matter Science and EngineeringThe Key Laboratory of Polymer Chemistry and Physics of the Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration&Reconstruction Hong Kong University of Science and Technology(HKUST)Clear Water BayKowloonHong Kong 999077China

Reducing the voltage loss(Vloss)is a critical factor in optimizing the open-circuit voltage(Voc)and overall power-c on version efficie ncy(PCE)of polymer solar cells.In the current work,by designing a novel electron-accepting unit of coronenediimide(CDI)and using it as the main functional building block,a new polymer acceptor CDI-V is developed and applied to fabricate all-polymer solar cells.Compared with the perylenediimide-based polymer acceptors we previously reported,the current CDI-V polymer possesses a noticeably elevated lowest unoccupied molecular orbital(LUMO).Thereby,by virtue of the enlarged energy gap between the donor HOMO and acceptor LUMO,a high Voc value of 1.05 V is achieved by the all-polymer photovolatic device,along with an impressively low Vloss of 0.55 V.As remarkably,in spite of an extremely small LUMO level offset of 0.01 eV exhibited by the donor and acceptor polymers,effective charge separation still takes place in the allpolymer device,as evidenced by a proper short-circuit current(Jsc)of 9.5 mA·cm^-2 and a decent PCE of 4.63%.

关键词： All-polymer solar cell Coronenediimide voltage loss Acceptors

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Reveal the large open-circuit voltage deficit of all-inorganic CsPbIBr_(2) perovskite solar cells

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Chinese Physics B 2022年第3期31卷 66-75页

作者：胡颖王家平赵鹏林珍华张思玉苏杰张苗张进成常晶晶郝跃 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an 710071China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'an 710071China

Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic–inorganic hybrid perovskite solar cells(PSCs),but the larger voltage loss(V_(loss)) cannot be ignored, especially CsPbIBr_(2), which limits the improvement of efficiency. To reduce V_(loss), one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer(CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum V_(loss) and high efficiency of CsPbIBr_(2)-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage(V_(oc)) is increased from 1.37 V to 1.52 V by replacing SnO_(2) with ZnO as the electron transport layer(ETL) due to more matching conduction band with the CsPbIBr;layer.

关键词： all-inorganic perovskites CsPbIBr_(2)solar cells device simulation voltage loss Silvaco TCAD

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Gradual chlorination at different positions of D-π-A copolymers based on benzodithiophene and isoindigo for organic solar cells

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Materials Reports(Energy) 2021年第4期1卷 68-76页

作者： Jialing Zhou Bao Zhang Yanfang Geng Qing Guo Qiang Guo Erjun Zhou CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190PR China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049PR China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001PR China

Isoindigo(IID)has been widely used as strong acceptor unit(A)to construct narrow bandgap polymers in organic field effect transistors(OFETs)and organic solar cells(OSCs).Combing with IID,we chose benzodithiophene(BDT)as the donor unit(D)and thieno[3,2-b]thiophene(TT)as theπbridge to construct a new type of D-π-A polymer PE70.Based on PE70,we adopt the chlorination strategy to fine-tune photoelectric characteristics and film morphology,and then developed PE74 and PE75.By blending with non-fullerene acceptor(NFA)Y6,device based on PE74 with chloride substitution on the BDT unit showed increasing photovoltaic performance.In addition,further chlorine substitution on the IID(PE75)would greatly reduce the non-radiative voltage loss(ΔV3),and the distorted molecular conformation also took responsible for the excessive recombination.As results,PE74:Y6-based device achieves a power conversion efficiency(PCE)of 11.06%with open-circuit voltage(VOC)of 0.76 V,which are higher than those of PE70:Y6(PCE of 10.40%and VOC of 0.72 V)and PE75:Y6-based device(PCE of 6.24%and VOC of 0.84 V).This work demonstrates the regularity of the photovoltaic performance caused by chlorination strategy in polymer in the non-fullerene OSC devices,which provide important insights into highperformance photovoltaic materials.

关键词： Isoindigo Polymer donor materials D-π-A polymer Chlorination strategy Non-fullerene acceptor voltage loss

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Investigation of Power Supply to Subsea Loads from High voltage Electric Source Using Modular Direct Current Scheme

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Journal of Power and Energy Engineering 2020年第6期8卷 22-34页

作者： Biweri Kainga Roupa Agbadede Department of Mechanical Engineering Nigeria Maritime University Warri Nigeria Department of Electrical Engineering Nigeria Maritime University Warri Nigeria

Subsea power converters have been identified in recent researches as a potential means of supplying power to subsea loads and this technology has been seen as a means to reduce the reliance on offshore platforms. This study analyses all electric subsea high power system for power generation and transmission in the offshore oil and gas industry for sustainable subsea development. In order to accomplish the analysis of power generation and transmission to subsea loads, the MAT lab SIMULINK software was employed to ascertain losses arising from the transmission of power to subsea systems. Data from Agbara and Akpo fields, all located in Nigeria, were analysed using the MSDC model as an alternative power source for power generation and transmission to all subsea loads. When the voltage loss between a step out distance at 30 km and 200 km was compared for the Akpo oil field, the plots indicate a significant loss in voltage. The RMS value of voltage loss increased from 0.8874 at a step out distance 30 km to 0.9449 for 200 km.

关键词： Subsea Loads Risk Analysis voltage loss Power Systems

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Electrochemical-thermal Coupled Model of Lithium-ion Batteries for Low Temperature Charging

Electrochemical-thermal Coupled Model of Lithium-ion Batteri...

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2016中国汽车工程学会年会暨展览会

作者： Wu Peng Jan Romberg Ge Hao Zhang Yakun Zhang Jianbo BMW China Services Ltd. State Key Laboratory of Automotive Safety and Energy Department of Automotive EngineeringTsinghua University

To study the low temperature charging performance of lithium- ion batteries,the electrochemical- thermal coupled model is developed.Some key parameters in the model are measured,which includes the kinetic related parameters and the thermal properties.The model is validated with the charging curves at different temperatures with two thermal boundary conditions and several C-rates.Using this model,the voltage loss during low temperature charging is brokendown to electrolyte voltage loss,electrode interfacial kinetic loss and solid particle concentration polarization loss.Results show that the negative electrode intercalation kinetic loss is the dominant during low temperature charging.

关键词： low temperature charging electrochemical-thermal coupled model voltage loss NCM cathode graphite anode electrochemical technique（PITT） charging protocols

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