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- 2019
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Journal article (peer-reviewed)
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| 2. |
- Lin, Y. B., et al.
(author)
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Energy-effectively printed all-polymer solar cells exceeding 8.61% efficiency
- 2018
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In: Nano Energy. - : Elsevier BV. - 2211-2855. ; 46, s. 428-435
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Journal article (peer-reviewed)abstract
- All-polymer solar cells (all-PSCs) have attracted tremendous attention in the past few years due to their unique advantages. However, up to now most of high-efficiency all-PSCs are processed by spin-coating with complicated post treatment processes, which is ill-suited to a large-area roll-to-roll (R2R) technique. In this work, high-efficiency all-PSCs based on PTB7-Th and PNDI-T10 are achieved by one of R2R compatible printing techniques, i.e. doctor-blading, without any annealing treatment. It was found that incorporating an additive into all polymer blends solution can prolong the drying time of all polymer nanocomposites from 120 to 1000 s to form a better bulk heterojunction morphology and a higher crystallinity, which thus reduce charge recombination and show much better electrical impedance spectroscopy parameters. Record-breaking power conversion efficiencies (PCEs) of 8.61% and high fill factors (FF) of 0.71 are achieved by doctor-blading under an extremely process-simple and energy-effective conditions. Moreover, large-area (2.03 cm 2 ) flexible ITO-free all-PSCs by doctor-blading with record-breaking PCEs of 6.65% and FF of 0.65 are realized, which are much higher than conventional fullerene-based ones under the same condition, demonstrating that all-PSCs are more suitable for the flexible device structure and have a bright future towards practical application with R2R manufacture.
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| 3. |
- Lin, Y. B., et al.
(author)
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Study of ITO-free roll-to-roll compatible polymer solar cells using the one-step doctor blading technique
- 2017
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 5:8, s. 4093-4102
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Journal article (peer-reviewed)abstract
- Extremely simple one-step coating ITO-free inverted polymer solar cells (IFIPSCs) have been fabricated using a novel film deposition method-doctor blading technique, which is completely compatible with roll-to-roll (R2R) manufacturing. Delamination of the interfacial buffer layer (IBL) from the photoactive mixtures is achieved via a spontaneous vertical self-assembly. The performance of one-step doctor-blading IFIPSCs is primarily influenced by the inherent IBL stratification purity rather than the fine donor/acceptor phase separation for the rigid backbone PTB7 system, which is significantly different from that of the conventional two-step doctor blading devices. The surface energy results strongly demonstrate that the formation of the interfacial layer between the ITO-free cathode and the photoactive layer is significantly controlled by the solvent drying time, which determines the self-assembly quality and can be greatly manipulated from 2700 to 1200 s by different substrate temperatures. It's worth noting that the pure interfacial layer formed at low substrate temperatures improves charge separation and transport, whereas high substrate temperatures limit its growth, leading to the decrease of device performance. The detailed relationship between the self-assembly interfacial layer and the internal resistance and capacitance is revealed by impedance spectroscopy. Encouraging power conversion efficiency (PCE) of 6.56% is achieved from simple one-step doctor-blading ITO-free devices at a very low substrate temperature of 25 degrees C, which is energy saving and appropriate for industrialized R2R production. In contrast, the highest PCE of 7.11% ever reported for two-step doctor-blading ITO-free IFIPSCs was obtained at a high substrate temperature of 60 degrees C for achieving a fine morphology without regard to the vertical delamination. Furthermore, for crystalline polymer systems like P3TI with a semiflexible chain, it requires a higher substrate temperature of 40 degrees C to mediate the balance of vertical selfassembly stratification of the interfacial buffer layer and photoactive morphology to maximize the device performance.
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