The study of solvent additive effects in efficient polymer photovoltaics via impedance spectroscopy

Yao, En‐Ping; Chen, Chun Chao; Gao, Jing; Liu, Yongsheng; Chen, Qi; Cai, Min; Hsu, Wei Chou; Hong, Ziruo; Li, Gang; Yang, Yang

doi:10.1016/j.solmat.2014.05.049

Cited by 78 publications

(69 citation statements)

References 49 publications

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“…Electrochemical impedance spectroscopy (EIS) measurements were performed to detailedly illustrate the change transport process and charge carrier recombination of NPs ZnO/PffBT4T‐2OD: PCBM, NPs ZnO/PTB7‐Th: PCBM, sol‐gel ZnO/PffBT4T‐2OD: PCBM and sol‐gel ZnO/PTB7‐Th: PCBM PSCs. The inset in Figure is an equivalent circuit of PSCs, and impedance spectra were employed at the open circuit voltage condition under 1 sun irradiation condition in a frequency ranged from 100 Hz to 1 MHz . The Nyquist plots of the impedance spectra for the PSCs using an equivalent circuit, exhibiting a reasonable concordance with a simulated curve, as shown in Figure and the parameters listed in Table .…”

Section: Resultsmentioning

confidence: 71%

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

et al. 2018

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As one of the most widely used electron transport layers (ETLs) for inverted polymer solar cells (PSCs), ZnO has great effect on the growth of photo‐generated layer. In this work, the ZnO‐based PSCs with the compositional blend of PffBT4T‐2OD: PCBM and PTB7‐Th: PCBM are fabricated to investigate the crystallinity modulation effect (CME) between electron transport layer and photo‐generation materials. The results showed that both the high crystallinity PffBT4T‐2OD: PCBM processed on the large nanoparticles ZnO and the low crystallinity PTB7‐Th: PCBM processed on small nanoparticles ZnO exhibit excellent photovoltaic performances. By verifying the combination of ZnO nanoparticles with photo‐generation materials, it proves that the CME can result in a smooth photo‐generated layer surface to ensure efficient electron transport as well as collection with suppressed bimolecular recombination, leading to the increase of photocurrent and the improvement of inverted PSCs performance accordingly.

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Section: Resultsmentioning

confidence: 71%

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

et al. 2018

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“…It is inferred from the above analysis that vast ITIC molecules deposited at the bottom of BHJ without DIO should be mainly attributed to the higher surface energy of pure ITIC compared to that of pure PTB7-Th. [48] The longer τ avg means the lower carrier recombination. However, redundant ITIC migrated to the top surface of BHJ employing superfluous 1 vol% DIO, resulting in ITIC accumulation on the top surface.…”

Section: Bis[5-(2-ethylhexyl)-2-thienyl]mentioning

confidence: 99%

Printed Nonfullerene Organic Solar Cells with the Highest Efficiency of 9.5%

Lin

Jin

Dong

et al. 2018

Advanced Energy Materials

102

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The current work reports a high power conversion efficiency (PCE) of 9.54% achieved with nonfullerene organic solar cells (OSCs) based on PTB7‐Th donor and 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene) (ITIC) acceptor fabricated by doctor‐blade printing, which has the highest efficiency ever reported in printed nonfullerene OSCs. Furthermore, a high PCE of 7.6% is realized in flexible large‐area (2.03 cm2) indium tin oxide (ITO)‐free doctor‐bladed nonfullerene OSCs, which is higher than that (5.86%) of the spin‐coated counterpart. To understand the mechanism of the performance enhancement with doctor‐blade printing, the morphology, crystallinity, charge recombination, and transport of the active layers are investigated. These results suggest that the good performance of the doctor‐blade OSCs is attributed to a favorable nanoscale phase separation by incorporating 0.6 vol% of 1,8‐diiodooctane that prolongs the dynamic drying time of the doctor‐bladed active layer and contributes to the migration of ITIC molecules in the drying process. High PCE obtained in the flexible large‐area ITO‐free doctor‐bladed nonfullerene OSCs indicates the feasibility of doctor‐blade printing in large‐scale fullerene‐free OSC manufacturing. For the first time, the open‐circuit voltage is increased by 0.1 V when 1 vol% solvent additive is added, due to the vertical segregation of ITIC molecules during solvent evaporation.

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“…Inspired by recent work on post-solvent treatment, [29][30][31][32][33]. We modified the literature procedure as follows: (i) spin-coated the active layer and dried under vacuum; (ii) ethanol (or other polar solvents) was added dropwise on top of the active layer and a short wet time (such as 45 s) was required; (iii) polar solvent was removed by spin coating at high speed (such as 2500 rpm); (iv) dried under vacuum and annealed at 100 o C for 10 min.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Effective side chain selection for enhanced open circuit voltage of polymer solar cells based on 2D-conjugated anthracene derivatives

Ouyang

Liu

et al. 2015

Dyes and Pigments

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The study of solvent additive effects in efficient polymer photovoltaics via impedance spectroscopy

Cited by 78 publications

References 49 publications

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

Printed Nonfullerene Organic Solar Cells with the Highest Efficiency of 9.5%

Effective side chain selection for enhanced open circuit voltage of polymer solar cells based on 2D-conjugated anthracene derivatives

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