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- 2019
- magnetic Stamp
- fluidic assembly
- static electricity
- Van der Waals force
- laser release
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- roll printing
- Micro-LED
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- Southern University of Science and Technology
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Green Solvent-Processed Organic Solar Cells Based on Low Cost Polymer Donor and Small Molecule Acceptor
摘要： Low cost photovoltaic materials and green solvent processing are important issues for commercial application of organic solar cells (OSCs). Here, we fabricated high-performance OSCs based on low-cost conjugated polymer PTQ10 as donor and small molecule n-type organic semiconductor HO-IDIC-2F as acceptor, using non-halogen tetrahydrofuran (THF) as processing solvent. The power conversion efficiency (PCE) of the as-cast OSCs reached 12.20%, which is comparable with the ones processed with chloroform (CF) (12.43%). Thermal stability of the active layer was also studied by thermal treatment at 100°C for 8 hours. As a result, the active layer morphology remained unchanged and the PCE of the devices still reached 12.13%, indicating a good thermal-stability of the PTQ10:HO-IDIC-2F blend film. As commonly known, for OSCs fabricated in larger scales, layer by layer (LL) method generally provide more advantages than the traditional D-A blend solution-processing method. Therefore, to test the compatibility of THF solvent in LL method, we fabricated the blade-coated LL devices with THF as a single type of solvent for both donor and acceptor, and the PCE could reach up to 11.85%. The surprisingly high performance of the blade-coated OSC based on green solvent indicates that PTQ10 is a promising donor to be processed in green solvent for LL technology in the future.
关键词： PTQ10,green solvent,thermal stability,organic solar cells,layer-by-layer method,HO-IDIC-2F
更新于2025-09-19 17:13:59
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Optimized mixed phases to achieve improved performance of organic solar cells
摘要： In the three-phase (pure donor, pure acceptor, and mixed phases) morphologies of organic solar cells, the mixed phases produce an energy cascade that promotes the generation of free carriers. However, how to optimize the content of the mixed phases is a challenging problem. The authors proposed to control different content of mixed phases in DRTB-T and IDIC blends by additive and solvent vapor annealing (SVA). The authors ?rst formed the largest extent amount of mixed phases by the additive cinene (2%) to inhibit the crystallization of DRTB-T and IDIC. And then, different amounts of mixed phases were achieved by further SVA for different times (from 0 to 50 s) to increase the content of pure DRTB-T and IDIC phases. The energetic offsets (ΔE) of pure and mixed phases gradually decrease from 0.529 to 0.477 eV for different content of mixed phases. When ΔE was 0.498 eV, the highest photocurrent density (Jsc) was obtained. The power conversion ef?ciency was increased from 3.23% (without any treatment) to 8.54%. Therefore, the authors demonstrated that the optimized content of the mixed phases is critical to device performance.
关键词： solvent vapor annealing,additive,organic solar cells,power conversion efficiency,DRTB-T,energy cascade,cinene,IDIC,mixed phases
更新于2025-09-11 14:15:04