Effect of donor–acceptor molecular orientation on charge photogeneration in organic solar cells

Lee, Hansol; Lee, Dong Ki; Sin, Dong Hun; Kim, Sang Woo; Jeong, Mun Seok; Cho, Kilwon

doi:10.1038/s41427-018-0054-1

Cited by 54 publications

(40 citation statements)

References 59 publications

(109 reference statements)

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“…This indicates that exciton dissociation is accompanied by depolarization processes which, although unclear at present, may be related to a restricted charge generation and transport for a donor–acceptor interface featuring edge‐on and face‐on orientations of the respective materials. [ 47 ] Moreover, this process is found to depend on the specific donor–acceptor system, as will be shown below.…”

Section: Resultsmentioning

confidence: 89%

Polarization‐Sensitive Photodetectors Based on Directionally Oriented Organic Bulk‐Heterojunctions

Perevedentsev

Mejri

Ruiz‐Preciado

et al. 2022

Advanced Optical Materials

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Polarized spectroscopic photodetection enables numerous applications in diverse areas such as sensing, industrial quality control, and visible light communications. Although organic photodetectors (OPDs) can offer a cost‐effective alternative to silicon‐based technology—particularly when flexibility and large‐area arrays are desired—polarized OPDs are only beginning to receive due research interest. Instead of resorting to external polarization optics, this report presents polarized OPDs based on directionally oriented blends of poly(3‐hexylthiophene) (P3HT) and benchmark polymer or nonfullerene acceptors fabricated using a versatile solution‐based method. Furthermore, a novel postprocessing scheme based on backfilling and plasma etching is advanced to ameliorate high dark‐currents that are otherwise inherent to fibrillar active layers. The resulting polarized P3HT:N2200 OPDs exhibit a broad enhancement across all principal figures of merit compared to reference isotropic devices, including peak responsivities of 70 mA W−1 and up to a threefold increase in 3 dB bandwidth to 0.75 MHz under parallel‐polarized illumination. Polarization ratios of up to 3.5 are obtained across a spectral range that is determined by the specific donor–acceptor combinations. Finally, as a proof‐of‐concept demonstration, polarized OPDs are used for photoelasticity analysis of rubber films under tensile deformation, highlighting their potential for existing and emerging applications in advanced optical sensing.

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Section: Resultsmentioning

confidence: 89%

Polarization‐Sensitive Photodetectors Based on Directionally Oriented Organic Bulk‐Heterojunctions

Perevedentsev

Mejri

Ruiz‐Preciado

et al. 2022

Advanced Optical Materials

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“…P3HT in different solutions can exhibit different aggregation behavior (H-or J-aggregate), which can be distinguished by UV-vis absorption spectra. [118] In 2001, the effect of solvents on the aggregated structure and photovoltaic properties of fullerene-based blend films was confirmed by Hummelen et al [201] In the P3HT:PCBM system, Hansol et al [202] pointed out that the orientation of P3HT or PCBM has a great influence on the charge generation in PSCs. When spun-cast from the low boiling point solvent CF (61 • C), P3HT films with face-on orientation, which can generate charge more efficiently and reduce exciton recombination at the interface, while the edgeon molecule orientation was obtained by spin-coating with high boiling point solvent DCB (182 • C; see Figure 6B).…”

Section: Polythiophenesmentioning

confidence: 92%

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

et al. 2021

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π-Conjugated organic/polymer materials-based solar cells have attracted tremendous research interest in the fields of chemistry, physics, materials science, and energy science. To date, the best-performance polymer solar cells (PSCs) have achieved power conversion efficiencies exceeding 18%, mostly driven by the molecular design and device structure optimization of the photovoltaic materials. This review article provides a comprehensive overview of the key advances and current status in aggregated structure research of PSCs. Here, we start by providing a brief tutorial on the aggregated structure of photovoltaic polymers. The characteristic parameters at different length scales and the associated characterization techniques are overviewed. Subsequently, a variety of effective strategies to control the aggregated structure of photovoltaic polymers are discussed for polymer:fullerene solar cells and polymer:nonfullerene small molecule solar cells. Particularly, the control strategies for achieving record efficiencies in each type of PSCs are highlighted. More importantly, the in-depth structure-performance relationships are demonstrated with selected examples. Finally, future challenges and research prospects on understanding and optimizing the aggregated structure of photovoltaic polymers and their blends are provided.

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“…π-Conjugated polymers are attractive materials for the construction of functional organic optoelectronic devices [1][2][3][4] . According to the theoretical calculations carried out by Lagowski and coworkers, the incorporation of heteroatoms into the main chain of π-conjugated polymers provides us the chance to alter the energy levels of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO).…”

Section: Introductionmentioning

confidence: 99%

Preparation of a germole-containing π-conjugated polymer by the Te–Li exchange reaction of a tellurophene-containing polymer

et al. 2020

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The synthesis and optoelectronic functions of a germole-containing π-conjugated polymer prepared by the reaction of a lithiated polymer precursor are described. A regioregular organometallic polymer having 1,4-dilithio-1,3-butadiene and 9,9-dioctylfluorene-2,7-diyl units was generated by the reaction of a tellurophene-containing polymer having a number-average molecular weight (M n) and molecular weight distribution (M w /M n) of 5900 and 1.9, respectively, with n-butyllithium (2.4 equiv) at −78 to −60°C for 3 h. The prepared lithiated polymer was reacted with dimethylgermanium dichloride (1.5 equiv) at −60°C to ambient temperature for 12 h in tetrahydrofuran to produce a π-conjugated polymer possessing 1,1-dimethylgermole-2,5-diyl units in 76% yield (M n = 4400 and M w /M n = 1.7). The absorption maximum and onset of the obtained polymer were observed at 465 and 535 nm, respectively, in the UV-vis spectrum, from which the optical band gap of the polymer was estimated to be 2.31 eV. In the photoluminescence spectrum, the obtained polymer exhibits green fluorescence with an emission maximum of 547 nm and a quantum yield of 0.04. The chemical interaction of the dimethylgermole-containing π-conjugated polymer with fluoride was also examined in terms of the changes observed in the UV-vis absorption spectra.

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Effect of donor–acceptor molecular orientation on charge photogeneration in organic solar cells

Cited by 54 publications

References 59 publications

Polarization‐Sensitive Photodetectors Based on Directionally Oriented Organic Bulk‐Heterojunctions

Polarization‐Sensitive Photodetectors Based on Directionally Oriented Organic Bulk‐Heterojunctions

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

Preparation of a germole-containing π-conjugated polymer by the Te–Li exchange reaction of a tellurophene-containing polymer

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