Hybrid Nonfused-Ring Electron Acceptors with Fullerene Pendant for High-Efficiency Organic Solar Cells

Zhou, Yuanyuan; Li, Miao; Shen, Shuaishuai; Wang, Jing; Zheng, Ruiting; Lü, Hao; Liu, Yahui; Ma, Zaifei; Song, Jinsheng; Bo, Zhishan

doi:10.1021/acsami.0c19632

Cited by 23 publications

(19 citation statements)

References 49 publications

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“…A similar conclusion can be drawn by characterizing the PL intensities of the different films (Figure S8 and 2e). , As expected, the enormously quenched PL intensity of IDTBT in the IDTBT:PC 61 BM BHJ was subsequently further quenched after the BHJ was stacked on the PDPP4T surface. This is consistent with photohole injection into PDPP4T, which breaks the thermodynamic equilibrium between exciton separation and recombination in the BHJ.…”

supporting

confidence: 77%

Hierarchical Heterojunction Enhanced Photodoping of Polymeric Semiconductor for Photodetection and Photothermoelectric Applications

Zhao

Xiang

et al. 2022

ACS Materials Lett.

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The realization of efficient photodoping of polymeric semiconductors (PSCs) is crucial for the construction of high-performance photodetectors and photothermoelectric devices. Traditional layer or bulk heterojunction can enhance the photodoping of PSCs but suffers from a trade-off in balancing photocarrier generation and charge transport. Herein, we report on a hierarchical heterojunction comprising a bulk heterojunction photoactive layer and a separate charge transport layer, fabricated by using a simple orthogonal solvent method. The well-designed interfacial energy-level alignment of the hierarchical heterojunction contributes to efficient exciton separation and charge transfer into the charge transport layer, thus resulting in improved photodetection and photothermoelectric conversion. The photodetector exhibits photosensitivity and photoresponsivity of up to 1.1 × 107 and 9.2 × 106 A W–1, respectively, while the photothermoelectric device displays a maximum power factor of 13.7 μW m–1 K–2. These results indicate that hierarchical heterojunction-enhanced photodoping can serve as a powerful strategy to enable the multifunctional applications of PSCs.

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supporting

confidence: 77%

Hierarchical Heterojunction Enhanced Photodoping of Polymeric Semiconductor for Photodetection and Photothermoelectric Applications

Zhao

Xiang

et al. 2022

ACS Materials Lett.

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“…Then, we calculated the charge transfer state energy (E ct ) from the electroluminescence (EL) and highly sensitive external quantum efficiency (sEQE) spectra (as shown in Figure S8, Supporting Information), using the method described in the literature. [45][46][47] As listed in Table 3, the E ct values increase gradually from 1.34 eV for 2Th-2F-based device to 1.36 and 1.38 eV for BTh-Th-2F and 2BTh-2F-based ones.…”

Section: Photovoltaic Propertiesmentioning

confidence: 85%

Simple Nonfused Ring Electron Acceptors with 3D Network Packing Structure Boosting the Efficiency of Organic Solar Cells to 15.44%

Wang

Lü

Liu

et al. 2021

Advanced Energy Materials

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122

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Zhan et al. reported a fused ring electron acceptor (FREA) ITIC with an acceptordonor-acceptor (A-D-A) type structure. [1] Subsequently, numerous FREAs are developed by researchers, which largely promoted the photovoltaic performance of OSCs. Recently, Zou et al. developed a series of A-DA′D-A type FREAs (Y6 series). Up to now, the highest power conversion efficiency (PCE) of OSCs based on FREAs has reached 18%, demonstrating the bright future for practical application. [2][3][4][5][6][7][8][9] Although FREAs can achieve high efficiency, they are expensive and their syntheses are complicated, which usually includes low-yield ring-closure reactions. For the commercialization of OSCs, it is highly desired to develop highperformance and low-cost nonfullerene acceptors. Therefore, we want to develop simple nonfused ring electron acceptors (NFREAs) to replace the high-cost FREAs. In 2017, we first postulated and proved that intramolecular noncovalent interactions could be used to partially replace chemical bonds to synthesize NFREAs. [10] Since then, small fused ring building blocks such as indacenodithiophene (IDT), [11][12][13][14] cyclopentadithiophene (CPDT), [15][16][17][18][19][20][21][22][23][24] etc., were often used for the construction of NFREAs. Later, researchers also developed fully nonfused ring electron acceptors. [25][26][27] However, the photovoltaic performance of the solar cells based on NFREAs is still far behind the FREAs.Typical FREAs consist of a fused ring core, side chains, and two electron-withdrawing terminal groups. [28][29][30][31] The planar fused ring core is beneficial for the electron delocalization. The side chain can increase the solubility and affect the molecular stacking of acceptors. The electron-withdrawing terminal group such as 3-(1,1-dicyanomethylene)-5,6-difluoro-1-indanone can induce a strong intramolecular charge transfer (ICT) effect in the acceptor molecule, which can remarkably broaden the absorption, lower the energy levels (especially the lowest unoccupied molecular orbital (LUMO)), and enhance the molecular stacking. [32][33][34] Besides these basic characteristics, recent reports begin to focus on molecular stacking model. There is growing evidence that high-performance FREAs possess a 3D network packing structure, being in favor of facilitating multiple charge transport, achieving small exciton binding energy, and reducing energy loss in OSCs. [5,[35][36][37][38][39] Unlike rigid FREAs, the molecular Three nonfused ring electron acceptors (NFREAs; 2Th-2F, BTh-Th-2F, and 2BTh-2F) with thieno[3,2-b]thiophene bearing two bis(4-butylphenyl)amino substituents as the core, 3-octylthiophene or 3-octylthieno[3,2-b]thiophene as the spacer, and 3-(1,1-dicyanomethylene)-5,6-difluoro-1-indanone as the terminal group are designed and synthesized. The molar extinction coefficient of acceptors and the electron mobility of blend films gradually increase with increasing π-conjugation length. Moreover, 2BTh-2F displays a planar molecular conformation assisted by S•••N and S•••O intr...

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“…For the D18/ Isopropyl-2F blend film, the large molar extinction coefficient and wider absorption range are beneficial for achieving a high J sc of the OCSs. The optical bandgaps ( E g opt ) were estimated to be 1.38 eV for Isopropyl-0F and 1.31 eV for Isopropyl-2F . Using cyclic voltammetry (CV), the energy levels of Isopropyl-0F and Isopropyl-2F were estimated.…”

Section: Resultsmentioning

confidence: 99%

Designing High-Performance Nonfused Ring Electron Acceptors via Synergistically Adjusting Side Chains and Electron-Withdrawing End-Groups

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Three nonfused ring electron acceptors, Hexyl-0F, Isopropyl-0F, and Isopropyl-2F, are designed and synthesized. Unlike Hexyl-0F, Isopropyl-0F with two sterically hindered 2,4,6triisopropyl-phenyl groups is highly soluble, which provides a good opportunity for solution processability. Compared with Isopropyl-0F, Isopropyl-2F with fluorinated end-groups exhibits red-shifted absorption. Due to these synergistic adjustment, Isopropyl-2Fbased devices displayed a high power conversion efficiency of 12.55%, higher than that of Isopropyl-0F (9.49%). The result demonstrates that the introduction of large steric substituents in the π-bridge units and electron-withdrawing end-groups plays a positive role in the construction of high-efficiency nonfused ring electron acceptors.

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Hybrid Nonfused-Ring Electron Acceptors with Fullerene Pendant for High-Efficiency Organic Solar Cells

Cited by 23 publications

References 49 publications

Hierarchical Heterojunction Enhanced Photodoping of Polymeric Semiconductor for Photodetection and Photothermoelectric Applications

Hierarchical Heterojunction Enhanced Photodoping of Polymeric Semiconductor for Photodetection and Photothermoelectric Applications

Simple Nonfused Ring Electron Acceptors with 3D Network Packing Structure Boosting the Efficiency of Organic Solar Cells to 15.44%

Designing High-Performance Nonfused Ring Electron Acceptors via Synergistically Adjusting Side Chains and Electron-Withdrawing End-Groups

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