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分子量依赖的 PCDTBT:PC71BM 混合物的垂直组成分布用于有机光伏

Molecular weight dependent vertical composition profiles of PCDTBT:PC₇₁BM blends for organic photovoltaics.

机构信息

Ossila Ltd, Kroto Innovation Centre, Broad Lane, Sheffield, S3 7HQ, UK.

Department of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK.

出版信息

Sci Rep. 2014 Jun 13;4:5286. doi: 10.1038/srep05286.

DOI:10.1038/srep05286
PMID:24924096
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4055896/
Abstract

We have used Soxhlet solvent purification to fractionate a broad molecular weight distribution of the polycarbazole polymer PCDTBT into three lower polydispersity molecular weight fractions. Organic photovoltaic devices were made using a blend of the fullerene acceptor PC₇₁BM with the molecular weight fractions. An average power conversion efficiency of 5.89% (peak efficiency of 6.15%) was measured for PCDTBT blend devices with a number average molecular weight of Mn = 25.5 kDa. There was significant variation between the molecular weight fractions with low (Mn = 15.0 kDa) and high (Mn = 34.9 kDa) fractions producing devices with average efficiencies of 5.02% and 3.70% respectively. Neutron reflectivity measurements on these polymer:PC₇₁BM blend layers showed that larger molecular weights leads to an increase in the polymer enrichment layer thickness at the anode interface, this improves efficiency up to a limiting point where the polymer solubility causes a reduction of the PCDTBT concentration in the active layer.

摘要

我们使用索氏溶剂提纯法将聚咔唑聚合物 PCDTBT 的宽分子量分布分成三个低分散分子量分数。使用富勒烯受体 PC₇₁BM 与分子量分数的混合物制造有机光伏器件。对于具有数均分子量 Mn = 25.5 kDa 的 PCDTBT 共混器件，测量到的平均功率转换效率为 5.89%（峰值效率为 6.15%）。分子量分数之间存在显著差异，低分子量（Mn = 15.0 kDa）和高分子量（Mn = 34.9 kDa）分数分别产生平均效率为 5.02%和 3.70%的器件。这些聚合物：PC₇₁BM 共混层的中子反射率测量表明，较大的分子量导致在阳极界面处增加聚合物富集层的厚度，这提高了效率，直到聚合物溶解度导致活性层中 PCDTBT 浓度降低的限制点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/e2336ebf2f85/srep05286-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/c083dabb1a7f/srep05286-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/7728477bc363/srep05286-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/7d3d1b904954/srep05286-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/4ef8e91cec99/srep05286-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/e2336ebf2f85/srep05286-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/c083dabb1a7f/srep05286-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/7728477bc363/srep05286-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/7d3d1b904954/srep05286-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/4ef8e91cec99/srep05286-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7b0e/4055896/e2336ebf2f85/srep05286-f5.jpg

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