Multi‐Length‐Scale Morphologies Driven by Mixed Additives in Porphyrin‐Based Organic Photovoltaics

Gao, Ke; Miao, Jingsheng; Xiao, Liangang; Deng, Wanling; Kan, Yuanyuan; Liang, Tianxiang; Wang, Cheng; Huang, Fei; Peng, Junbiao; Cao, Yong; Liu, Feng; Russell, Thomas P.; Wu, Hongbin; Peng, Xiaobin

doi:10.1002/adma.201505645

Cited by 256 publications

(173 citation statements)

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“…Many important structure–property relationships have been obtained. For example, Ade and co‐workers showed the importance of molecular miscibility and phase purity in polymer–PCBM‐based BHJ blends and Russell and co‐workers revealed multilength‐scale morphology and fibrillar network structures in OPVs.…”

Section: Characterizing the Lateral Phase Separation In Bhj Thin Filmmentioning

confidence: 99%

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Morphology Characterization of Bulk Heterojunction Solar Cells

et al. 2018

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Revealing the nanostructure of bulk‐heterojunction (BHJ) photovoltaic blends is a critical task in the field of organic photovoltaics. The complicated morphology, ranging from binary blends to ternary mixtures, shows quite varied structural details that need to be fully characterized in terms of correlating them with device performance. The nonequilibrium nature of the BHJ thin‐film morphology makes the structure optimization difficult, and fundamental principles that relate to chemical structure, processing methods, and device performances have not yet been fully understood. On the other hand, various high‐powered techniques ranging from in‐house instrumentation to synchrotron techniques have been applied to this tremendously difficult research topic. More structural details, including length scale of phase separation, structural ordering, chain/molecular orientation, surface topology, etc., can be obtained in a quantitative manner, which finally allows the structure–property relationships to be determined. Here, the most important characterization techniques in understanding the morphology of BHJ solar cells are summarized, targeting chemists and materials scientists.

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Section: Characterizing the Lateral Phase Separation In Bhj Thin Filmmentioning

confidence: 99%

“…g,h) Bright‐field TEM (g) and HAADF‐STEM (h) of DPPEZnP‐TBO/PCBM blend films from the mixture of Py and DIO (DPPEZnP‐TBO: porphyrin‐DPP molecules with 2‐butyloctyl side chains; Py: pyridine; DIO: 1,8‐diiooctane). Reproduced with permission . Copyright 2016, Wiley‐VCH.…”

Section: Characterizing the Lateral Phase Separation In Bhj Thin Filmmentioning

confidence: 99%

Morphology Characterization of Bulk Heterojunction Solar Cells

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“…The π-π stacking peak for thermally annealed blend also shifted to 1.74 Å −1 , indicating more contributions form the polymer component. [46,47] Overall, a quite clear relationship between GIWAX and their mobility, recombination and PCE for the three series of blends cannot be defined due to their low crystalline nature. [43,44] Meanwhile, reduced ITIC crystallization indicate that PBDT-TT and ITIC had good molecular mixing, which forms mixed domains upon thermal treatment.…”

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confidence: 97%

Mapping Nonfullerene Acceptors with a Novel Wide Bandgap Polymer for High Performance Polymer Solar Cells

Liao

Yao

Gao

et al. 2018

Advanced Energy Materials

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A new weak electron‐deficient building block, bis(2‐ethylhexyl) 2,5‐bis(5‐bromothiophen‐2‐yl) thieno[3,2‐b]thiophene‐3,6‐dicarboxylate (TT‐Th), is incorporated to construct a wide‐bandgap (1.88 eV) polymer PBDT‐TT for nonfullerene polymer solar cells (NF‐PSCs). PBDT‐TT possesses suitable energy levels and complementary absorption when blended with both ITIC analogues (ITIC and IT‐M) and a near‐infrared (NIR) acceptor (6TIC). Moreover, PBDT‐TT exhibits good conjugated planarity and preferable face‐on orientation in the blended thin film, which are beneficial for charge transfer and carrier transport. The PSCs based on PBDT‐TT:IT‐M and PBDT‐TT:6TIC blend films yield high power conversion efficiencies of 11.38% and 11.03%, respectively. To the best of the authors' knowledge, the PCE of 11.03% for PBDT‐TT:6TIC‐based device is one of the highest values reported for NIR NF‐PSCs. This work demonstrates that TT‐Th is a useful new electron‐accepting building block for making p‐type wide bandgap polymers for efficient NIR NF‐PSCs.

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“…[3][4][5][6][7] Since chlorophylls (porphyrin analogues) are natural light-harvesting materials involving photo to energy transfer processes, the study of porphyrins and their analogues on OSCs has been one of the hottest topics since the very early reports on OSC studies. [13][14][15][16][17][18] Also, we still believe that porphyrin-based small molecules should play more roles in OSCs with reasonable structure optimization. 11,12 In recent years, there has been an increasing interest in solution-processed BHJ OSCs using porphyrin derivatives as electron donor materials since we reported conjugated donor-acceptor (D-A) porphyrin donor materials with enhanced PCEs from less than 1% to 9%.…”

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confidence: 99%