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Improving photovoltaic parameters of all-polymer solar cells through integrating two polymeric donors

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Science China Chemistry 2021年第11期64卷 2010-2016页

作者： Kang An Feng Peng wenkai zhong Wanyuan Deng Difei Zhang Lei Ying Hongbin Wu Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640China

The incorporation of an additional component into the bulk-heterojunction light-harvesting layer of polymer solar cells has been considered as an effective strategy to enhance photovoltaic *** we demonstrated that the photovoltaic parameters of all-polymer solar cells could be enhanced upon replacing a certain ratio of electron-donating polymer PTz BI-o F with a widely used wide-bandgap polymer donor *** photoluminescent characterizations confirmed the F?rster resonance energy transfer from incorporated PM6 to PTz BI-o ***,the combination of Fourier-transform photocurrent spectroscopy and electroluminescence external quantum efficiencies measurements demonstrated reduced non-radiative recombination energy loss upon the incorporation of PM6,resulting in a slightly enhanced open-circuit voltage of 0.88 V of the ternary cell regarding the binary PTz BI-o F:PFA1 *** optimized ternary blend devices comprising of PTz BI-o F:PM6:PFA1 presented an impressively high power conversion efficiency of 16.3%,and the efficiency remains 15%on a device with an enlarged effective area of 1 cm^(2),demonstrating the great potential of these all-PSCs for potential applications.

关键词： all-polymer solar cells ternary blend high performance large area device

Side-chain modification of polyethylene glycol on conjugated polymers for ternary blend all-polymer solar cells with efficiency up to 9.27%

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Science China Chemistry 2018年第4期61卷 427-436页

作者： Zhenye Li Baobing Fan Baitian He Lei Ying wenkai zhong Feng Liu Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Department of Physics and Astronomy Shanghai Jiao Tong University

With the rapid progress achieved by all-polymer solar cells(all-PSCs), wide-bandgap copolymers have attracted intensive attention for their unique advantage of constructing complementary absorption profiles with conventional narrow-bandgap copolymers. In this work, we designed and synthesized a wide bandgap ternary copolymer PEG-2% which has the benzodithiophene-alt-difluorobenzotriazole as the backbone and the polyethylene glycol(PEG) modified side chain. The PBTA-PEG-2%:N2200 can be processed with a non-chlorinated solvent of 2-methyl-tetrahydrofuran(MeTHF) for the binary all-PSC, which exhibits a moderate photovoltaic performance. In particular, the ternary all-PSCs that consisting an additional narrow bandgap polymer donor PTB7-Th can also be processed with MeTHF, resulting in an unprecedented power conversion efficiency(PCE)of 9.27%, and a high PCE of 8.05% can be achieved with active layer thickness of 240 nm, both of which are the highest values so far reported from all-PSCs. Detailed investigations revealed that the dramatically improved device performances are attributable to the well-extended absorption band in the photoactive layer. Hence,developing novel copolymers with tailored side chains, and introducing additional polymeric components, can broaden the horizon for high-performance all-PSCs.

关键词： all-polymer solar cells ternary blending wide bandgap conjugated polymers

Achieving over 16% efficiency for single-junction organic solar cells

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Science China Chemistry 2019年第6期62卷 746-752页

作者： Baobing Fan Difei Zhang Meijing Li wenkai zhong Zhaomiyi Zeng Lei Ying Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

To achieve high photovoltaic performance of bulk hetero-junction organic solar cells(OSCs), a range of critical factors including absorption profiles, energy level alignment, charge carrier mobility and miscibility of donor and acceptor materials should be carefully considered. For electron-donating materials, the deep highest occupied molecular orbital(HOMO) energy level that is beneficial for high open-circuit voltage is much appreciated. However, a new issue in charge transfer emerges when matching such a donor with an acceptor that has a shallower HOMO energy level. More to this point, the chemical strategies used to enhance the absorption coefficient of acceptors may lead to increased molecular crystallinity, and thus result in less controllable phase-separation of photoactive layer. Therefore, to realize balanced photovoltaic parameters, the donor-acceptor combinations should simultaneously address the absorption spectra, energy levels, and film morphologies. Here, we selected two non-fullerene acceptors, namely BTPT-4F and BTPTT-4F, to match with a wide-bandgap polymer donor P2F-EHp consisting of an imidefunctionalized benzotriazole moiety, as these materials presented complementary absorption and well-matched energy levels. By delicately optimizing the blend film morphology, we demonstrated an unprecedented power conversion efficiency of over 16% for the device based on P2F-EHp:BTPTT-4F, suggesting the great promise of materials matching toward high-performance OSCs.

关键词： organic solar cells wide bandgap polymer non-fullerene acceptor high performance

Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability

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Journal of Semiconductors 2023年第5期44卷 34-41页

作者： Kang An wenkai zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Frontiers Science Center for Transformative Molecules Center of Hydrogen Scienceand School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China South China Institute of Collaborative Innovation Dongguan 523808China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering&State Key Laboratory of Pulp&Paper Engineering South China University of TechnologyGuangzhou 510640China

Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs.

关键词： morphology all-polymer solar cells thermal stability sequential deposition

The structure-performance correlation of bulk-heterojunction organic solar cells with multi-length-scale morphology

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Science China Chemistry 2022年第8期65卷 1634-1641页

作者： Tianyu Hao wenkai zhong Shifeng Leng Rui Zeng Ming Zhang Lei Zhu Yankang Yang Jingnan Song Jinqiu Xu Guanqing Zhou Yecheng Zou Yongming Zhang Feng Liu School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesIn-situ Center for Physical ScienceCenter of Hydrogen ScienceShanghai Key Lab of Electrical Insulation&Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Fluorinated Functional Membrane Materials Shandong Dongyue Future Hydrogen Energy Materials CompanyZibo 256401China

We build a general multi-length-scale morphology model with mixing phase and pure phase fibril structure,and simulate corresponding organic solar cells *** multi-length-scale morphology optimization process by changing the proportion of mixing phase and pure phase in different period width cases shows a clear correlation between period width and device performance that a smaller period width with appropriate proportion of mixing phase and fibril structure is advantageous to achieve high-performance *** on multiple donor/acceptor blends have been carried out by varying the composition and processing condition,which afford good structure-performance correlation that supports the model *** is demonstrated that building such a multi-length-scale morphology merging the synergistic effects of mixing and pure phases is indeed an imperative avenue to improve device efficiency.

关键词： multi-length-scale morphology simulations organic photovoltaics morphology-performance relationship

Design Rules of the Mixing Phase and Impacts on Device Performance in High-Efficiency Organic Photovoltaics

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Research 2022年第4期2022卷 621-631页

作者： Jingnan Song Ming Zhang Tianyu Hao Jun Yan Lei Zhu Guanqing Zhou Rui Zeng wenkai zhong Jinqiu Xu Zichun Zhou Xiaonan Xue Chun-Chao Chen Weihua Tang Haiming Zhu Zaifei Ma Zheng Tang Yongming Zhang Feng Liu School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesCenter of Hydrogen ScienceShanghai Key Lab of Electrical Insulation Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Department of Physics Imperial Collge LondonLondon SW72AZUK School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005China Department of Chemistry Zhejiang UniversityHangzhou 310027China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company ZiboCityShandongProvince 256401China

In nonfullerene acceptor-(NFA-)based solar cells,the exciton splitting takes place at both domain interface and donor/acceptor mixture,which brings in the state of mixing phase into *** energetics and morphology are key parameters dictating the charge generation,diffusion,and *** is revealed that tailoringthe electronic properties of the mixing region by doping with larger-bandgap components could reduce the density of state but elevate the filling state level,leading to improved open-circuit voltage(V_(OC))and reduced *** monomolecular and bimolecular recombinations are shown to be intercorrelated,which show a Gaussian-like relationship with V_(OC) and linear relationship with short-circuit current density(JSC)and fill factor(FF).The kinetics of hole transfer and exciton diffusion scale with JSC similarly,indicating the carrier generation in mixing region and crystalline domain are equally *** the morphology perspective,the crystalline order could contribute to V_(OC) improvement,and the fibrillar structure strongly affects the *** observations highlight the importance of the mixing region and its connection with crystalline domains and point out the design rules to optimize the mixing phase structure,which is an effective approach to further improve device performance.

关键词： mixing crystalline diffusion