Solution-Processed Organic Solar Cells Based on Dialkylthiol-Substituted Benzodithiophene Unit with Efficiency near 10%

Kan, Bin; Zhang, Qian; Li, Miaomiao; Wan, Xiangjian; Ni, Wang; Long, Guankui; Wang, Yunchuang; Yang, Xuan; Feng, Huanran; Chen, Yongsheng

doi:10.1021/ja509703k

Cited by 675 publications

(502 citation statements)

References 38 publications

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“…[1][2][3][4][5][6][7] With such a promising initial efficiency, the long-term performance of OSCs also needs to be considered. 8,9 Extrapolated lifetimes of 2-3 years are reported in glass-on-glass encapsulated OSCs using the polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) blended with [6,6]-phenyl-C 60 -butyric acid methyl ester (PCBM), 10 and lifetimes of 7-10 years are reported in encapsulated OSCs with the polymer poly[9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT) 11 and fullerene [6,6]phenyl-C 70 -butyric acid methyl ester (PC 71 BM).…”

Section: Introductionmentioning

confidence: 99%

Molecular Packing and Arrangement Govern the Photo-Oxidative Stability of Organic Photovoltaic Materials

et al. 2015

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For long-term performance chemically robust materials are desired for organic solar cells (OSCs). Illuminating neat films of OSC materials in air and tracking the rate of absorption loss, or photobleaching, can quickly screen a material's photo-chemical stability. In this report, we photobleach neat films of OSC materials including polymers, solution-processed oligomers, solution-processed small molecules, and vacuum-deposited small molecules. Across the materials we test, we observe photobleaching rates that span seven orders of magnitude. Furthermore, we find that the film morphology of any particular material impacts the observed photobleaching rate, and that amorphous films photobleach faster than crystalline ones. In an extreme case, films of amorphous rubrene photobleach at a rate 2500 times faster than polycrystalline films. When we compare density to photobleaching rate, we find that stability increases with density. We also investigate the relationship between backbone planarity and chemical reactivity. The polymer PBDTTPD is more photostable than its more twisted and less ordered furan derivitative, PBDFTPD. Finally, we relate our work to what is known about the chemical stability of structural polymers, organic pigments, and organic light emitting diode materials. For the highest chemical stability, planar materials that form dense, crystalline film morphologies should be designed for OSCs.

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Section: Introductionmentioning

confidence: 99%

Molecular Packing and Arrangement Govern the Photo-Oxidative Stability of Organic Photovoltaic Materials

et al. 2015

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“…Fullerene derivatives with unique phase and multidimensional charge‐transporting capabilities have played a central role as electron acceptor in BHJ devices leading to ≈11% power conversion efficiency (PCE) 1, 2. In spite of the widespread usage of fullerene acceptors, they do suffer from drawbacks including weak absorption of visible light, poor chemical and electronic tunability, and high production cost.…”

mentioning

confidence: 99%

A Tetraperylene Diimides Based 3D Nonfullerene Acceptor for Efficient Organic Photovoltaics

Liu

Chen

et al. 2015

Advanced Science

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A nonfullerene acceptor based on a 3D tetraperylene diimide is developed for bulk heterojunction organic photovoltaics. The disruption of perylene diimide planarity with a 3D framework suppresses the self‐aggregation of perylene diimide and inhibits excimer formation. From planar monoperylene diimide to 3D tetraperylene diimide, a significant improvement of power conversion efficiency from 0.63% to 3.54% can be achieved.

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“…[1][2][3][4] Comparing to the polymer counterparts, organic solar cells based on small molecules have several unique advantages such as well-defined chemical structure, ease of purification, and reduced batch-to-batch variations. [5][6][7][8][9][10] Recent development of small molecule electron donor materials led to a milestone power conversion efficiency (PCE) of 10% in single-junction devices 10,11 and in tandem cells. 9 Meanwhile, the overall device performance of small molecule solar cells (SMSCs) is still inferior to their polymer counterparts due to a poor understanding and manipulating of the film morphology, which is crucial for exciton dissociation, charge transport, and collection.…”

mentioning

confidence: 99%

Efficiency enhancement in solution-processed organic small molecule: Fullerene solar cells via solvent vapor annealing

Miao

Cai

Liu

et al. 2015

Applied Physics Letters

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We report highly efficient small molecule solar cells (SMSCs) by using dichloromethane solvent vapor annealing method. The resulted devices delivered a power conversion efficiency (PCE) of 8.3%, which is among the highest in SMSCs. Comparing to the control devices, the short circuit current (Jsc), fill factor, and PCE of solvent vapor annealed devices are significantly improved. Summarizing the results of optical absorption, film morphology, and charge carrier transporting properties, we see that the enhanced structure order and reduced size of phase separation are major reasons for the improved device performances, establishing a solid structure-property relationship. The solvent vapor annealing method can thus be a useful method in device fabrication to enhance performances of SMSCs.

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Solution-Processed Organic Solar Cells Based on Dialkylthiol-Substituted Benzodithiophene Unit with Efficiency near 10%

Cited by 675 publications

References 38 publications

Molecular Packing and Arrangement Govern the Photo-Oxidative Stability of Organic Photovoltaic Materials

Molecular Packing and Arrangement Govern the Photo-Oxidative Stability of Organic Photovoltaic Materials

A Tetraperylene Diimides Based 3D Nonfullerene Acceptor for Efficient Organic Photovoltaics

Efficiency enhancement in solution-processed organic small molecule: Fullerene solar cells via solvent vapor annealing

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