Fang Yi, Hou Yanbing, Hu Yufeng, Teng Feng
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.
School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, China.
Materials (Basel). 2015 Jul 6;8(7):4050-4060. doi: 10.3390/ma8074050.
In this work, the transient photocurrent of the plasmon-enhanced polymer bulk heterojunction solar cells based on poly(3-hexylthiophene) (P3HT) and [6,6]-Phenyl C butyric acid methyl ester (PCBM) is investigated. Two kinds of localized surface plasmon resonance (LSPR) enhanced devices were fabricated by doping the gold nanoparticles (Au NPs) into the anode buffer layer and inserting Au NPs between the anode buffer layer and the active layer. We probed the dynamics of the turn-on and turn-off responses to 400 μs square-pulse optical excitation from the 380 nm and 520 nm light-emitting diodes (LED) driven by an electric pulse generator. The transient photocurrent curves of devices with Au NPs at different positions and under different excitation wavelength are compared and analyzed. The charge trapping/detrapping processes that occurred at the interface of Au NPs and the active layer were observed; these exhibit an overshoot in the initial fast rise of photocurrent response. Our results show that the incorporating position of Au NPs is an important key factor to influence the transient photocurrent behaviors.
在这项工作中，研究了基于聚（3-己基噻吩）（P3HT）和[6,6]-苯基丁酸甲酯（PCBM）的等离子体增强聚合物本体异质结太阳能电池的瞬态光电流。通过将金纳米颗粒（Au NPs）掺杂到阳极缓冲层中以及在阳极缓冲层和活性层之间插入Au NPs，制备了两种局域表面等离子体共振（LSPR）增强器件。我们探测了由电脉冲发生器驱动的380 nm和520 nm发光二极管（LED）对400 μs方脉冲光激发的开启和关闭响应的动力学。比较并分析了在不同位置和不同激发波长下含有Au NPs的器件的瞬态光电流曲线。观察到在Au NPs与活性层界面处发生的电荷俘获/去俘获过程；这些过程在光电流响应的初始快速上升中表现出一个过冲。我们的结果表明，Au NPs的掺入位置是影响瞬态光电流行为的一个重要关键因素。
