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Morphology Evolution in High-Performance Polymer Solar Cells Processed from Nonhalogenated Solvent.

ABSTRACT: A new processing protocol based on non-halogenated solvent and additive is developed to produce polymer solar cells with power conversion efficiencies better than those processed from commonly used halogenated solvent-additive pair. Morphology studies show that good performance correlates with a finely distributed nanomorphology with a well-defined polymer fibril network structure, which leads to balanced charge transport in device operation.

SUBMITTER: Cai W

PROVIDER: S-EPMC5115419 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature

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Morphology Evolution in High-Performance Polymer Solar Cells Processed from Nonhalogenated Solvent.

Cai Wanzhu W Liu Peng P Jin Yaocheng Y Xue Qifan Q Liu Feng F Russell Thomas P TP Huang Fei F Yip Hin-Lap HL Cao Yong Y

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20150526 8

<b>A new processing protocol based on non-halogenated solvent and additive</b> is developed to produce polymer solar cells with power conversion efficiencies better than those processed from commonly used halogenated solvent-additive pair. Morphology studies show that good performance correlates with a finely distributed nanomorphology with a well-defined polymer fibril network structure, which leads to balanced charge transport in device operation. ...[more]

PMID: 27980968

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Project description:Large-scale commercial synthesis of bulk-heterojunction (BHJ) solar cell materials is very challenging and both time and energy consuming. Synthesis of π-conjugated polymers (CPs) with uniform batch-to-batch molecular weight and low dispersity is a key requirement for better reproducibility of high-efficiency polymer solar cells. Herein, a conjugated polymer (CP) PTB7-Th, well known for its high performance, has been synthesized with high molecular weight and low dispersity in a closed microwave reactor. The microwave reaction procedure is known to be more controlled and consumes less energy. The precursors were strategically reacted for different reaction time durations to obtain the optimum molecular weight. All different CPs were well characterized using 1H NMR, gel permeation chromatography (GPC), UV-vis, photoluminescence (PL), electron spin resonance (ESR), and Raman spectroscopy, whereas the film morphology was extensively studied via atomic force microscopy (AFM) and grazing incidence X-ray diffraction (GIXRD) techniques. The effect of molecular weight on a conventional BHJ solar cell with PC71BM acceptor was investigated to derive systematic structure-property relationships. The CP obtained after 35 min of reaction time and integrated into BHJ devices under ambient conditions provided the best performance with a power conversion efficiency (PCE) of 8.09%, which was quite similar to the results of CPs synthesized via a thermal route. An enhanced PCE of 8.47% was obtained for the optimized polymer (35 min microwave reaction product) when device fabrication was carried out inside a glovebox. The organic thin-film transistor (OTFT) device with the microwave-synthesized CP displayed better hole mobility (0.137 cm2 V-1 s-1) as compared to that with the thermally synthesized CP. This study also proved that the device stability and reproducibility of the microwave-synthesized CP were much better and more consistent than those of the thermally developed CP.

Dataset Information

Morphology Evolution in High-Performance Polymer Solar Cells Processed from Nonhalogenated Solvent.

Publications

Morphology Evolution in High-Performance Polymer Solar Cells Processed from Nonhalogenated Solvent.

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