摘要
用连续波光致吸收光谱研究了3-己基取代聚噻吩和富勒烯混合薄膜中的长寿命离域极化子和局域化极化子,不同泵浦光强度下和不同样品温度下依赖于调制频率的光致吸收信号,结果表明:在毫秒时间级离域极化子和局域化极化子均显示出受缺陷态影响的分散的双分子复合过程;离域极化子和局域化极化子的复合是热活化过程,在激光强度近似为一个太阳常量时,离域极化子和局域化极化子复合的热活化能分别是25meV和13meV.
Continuous wave photoinduced absorption spectroscopy was used to investigate long lived Delocalized Polaron （DP） and Localized Polaron （LP） in the blend of regio-regular poly （3- hexylthiophene） （RR-P3HT） and [6, 6]-Phenyl-C61-Butyric acid Methyl ester （PCBM）. From the modulation frequency dependence of PIA signals at various pump intensities and sample temperatures, in millisecond time regime both LP and DP exhibited dispersive bimolecular recombination which was limited by the trap states and could be activated thermally; the activation energy for recombination of DP and LP is 25 meV and 13 meV with laser intensity similar to one sun illumination, respectively.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2014年第5期76-81,共6页
Acta Photonica Sinica
基金
国家自然科学基金(No.61006014)资助
