The mechanism of photo- and thermooxidation of poly(3-hexylthiophene) (P3HT) reconsidered
The mechanism of photo- and thermooxidation of poly(3-hexylthiophene) (P3HT) reconsidered
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DOI：
10.1016/j.polymdegradstab.2009.03.005
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发表时间：
2009-06-01
影响因子：
5.9
通讯作者：
Lemaitre, Noella
中科院分区：
文献类型：
--
作者：
Manceau, Matthieu;Rivaton, Agnes;Lemaitre, Noella
聚（3-己基噻吩）（P3HT）因其广泛应用于有机太阳能电池而成为人们极大兴趣的焦点。然而，P3HT在环境大气下的光化学和热稳定性相对较差，这导致太阳能电池的寿命缩短。因此有必要研究P3HT的光氧化和热氧化。 P3HT 薄膜在空气存在下接受紫外-可见光照射和热老化。记录老化样品红外光谱的变化，并鉴定氧化产物。随后开发了一种解释红外光谱变化的降解机制。正如之前报道的那样，这一机制证实单线态氧并不起决定性作用。氧化被证明涉及正己基侧链的自由基氧化和随后的噻吩环的降解。大分子主链的断裂导致π共轭的损失，从而引起样品的漂白。 (C) 2009 Elsevier Ltd. 保留所有权利。
Poly(3-hexylthiophene) (P3HT) has been the focus of great interest as it is widely used in organic solar cells. However, P3HT has relatively poor photochemical and thermal stability under ambient atmosphere, which leads to a reduced lifetime of the solar cells. It was therefore necessary to study the photo- and thermooxidation of P3HT. Thin P3HT films were exposed to UV-visible light irradiation and thermal ageing, both in the presence of air. Changes in the infrared spectra of the aged samples were recorded, and the oxidation products were identified. A degradation mechanism that accounted for the modifications in the infrared spectra was then developed. This mechanism confirmed that singlet oxygen plays no decisive role, as previously reported. Oxidation was shown to involve the radical oxidation of the n-hexyl side-chains and the subsequent degradation of the thiophene rings. The breaking of the macromolecular backbone resulted in a loss of pi-conjugation, provoking the bleaching of the sample. (C) 2009 Elsevier Ltd. All rights reserved.