首页|Optimizing the power conversion processes in diluted donor/acceptor heterojunctions towards 19.4％efficiency all-polymer solar cells

Optimizing the power conversion processes in diluted donor/acceptor heterojunctions towards 19.4％efficiency all-polymer solar cells

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All polymer solar cells(all-PSCs)promise mechanically-flexible and morphologically-stable organic pho-tovoltaics and have aroused increased interests very recently.However,due to their disorderly conforma-tion structures within the photoactive film,inefficient charge generation and carrier transport are observed which lead to inferior photovoltaic performance compared to smaller molecular acceptor-based photovoltaics.Here,by diluting PM6 with a cutting-edge polymeric acceptor PY-IT and diluting PY-IT with PM6 or D18,donor-dominating or acceptor-dominating heterojunctions were prepared.Synchrotron X-ray and multiple spectrometer techniques reveal that the diluted heterojunctions receive increased structural order,translating to enhanced carrier mobility,improved exciton diffusion length,and suppressed non-radiative recombination loss during the power conversion.As the results,the corre-sponding PM6+1％PY-IT/PY-IT+1％D18 and PM6+1％PY-IT/PY-IT+1％PM6 devices fabricated by layer-by-layer deposition received superior power conversion efficiency(PCE)of 19.4％and 18.8％respectively,along with enhanced operational lifetimes in air,outperforming the PCE of 17.5％in the PM6/PY-IT refer-ence device.

All-polymer solar cellsPower conversion efficiencyStructural orderCharge generation

Liang Wang、Chen Chen、Zirui Gan、Chenhao Liu、Chuanhang Guo、Weiyi Xia、Wei Sun、Jingchao Cheng、Yuandong Sun、Jing Zhou、Zexin Chen、Dan Liu、Wei Li、Tao Wang

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School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China

School of Materials and Microelectronics,Wuhan University of Technology,Wuhan 430070,Hubei,China

Key Research and Development Program of Hubei ProvinceNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities of China

2023BAB116522032385227319652073221WUT:2021Ⅲ016JC

2024

10.1016/j.jechem.2024.05.010

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.96(9)