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Improved Thermal Stability of Polymer Solar Cells by Incorporating Porphyrins
Author(s) -
Wang Sisi,
Qu Yunpeng,
Li Sijun,
Ye Feng,
Chen Zhaobin,
Yang Xiaoniu
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201403018
Subject(s) - materials science , thermal stability , differential scanning calorimetry , organic solar cell , chemical engineering , energy conversion efficiency , scanning electron microscope , polymer solar cell , optical microscope , polymer , solar cell , analytical chemistry (journal) , nanotechnology , organic chemistry , optoelectronics , composite material , chemistry , physics , engineering , thermodynamics
Thermal stability has been the important issue in organic solar cell, especially for the large scale fabrication and application in the future. In this work, a new strategy involving the introduction of porphyrin compound (BL) is proposed to prevent the [6,6]‐phenyl C61 butyric acid methyl ester (PC 61 BM) aggregation. The supramolecular interactions between PC 61 BM and BL are first demonstrated in PC 61 BM:BL binary blend, and then the effect of BL on P3HT:PC 61 BM blend is qualitatively and quantitatively studied by differential scanning calorimetry, UV–vis absorption spectroscopy, atomic force microscopy, optical microscopy, and fluorescence techniques. It is found that the BL addition not only stabilizes the morphology of P3HT:PC 61 BM blend films, but also shows a good ability to maintain the electron mobility by depressing the PC 61 BM crystallization. And the thermal stability of the devices based on P3HT:PC 61 BM:BL ternary blend films is therefore greatly improved. For example, 8 wt% BL doping drops the power conversion efficiency by 10.5% relative to its peak value after 48 h of annealing at 130 °C, while 71.5% of decrease is obtained for the device without BL after only 3 h of annealing. This strategy is preliminarily proved to be universal and will show great potentials in future commercialization of polymer solar cells.