An organosilane self-assembled monolayer incorporated into polymer solar cells enabling interfacial coherence to improve charge transport.
An organosilane self-assembled monolayer incorporated into polymer solar cells enabling interfacial coherence to improve charge transport.
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DOI：
10.1039/c6cp02722a
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Zhiqi Li;Xinyuan Zhang;Zhihui Zhang;Shujun Li;Chunyu Liu;Liang Shen;Wenbin Guo;S. Ruan
中科院分区：
文献类型：
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作者：
Zhiqi Li;Xinyuan Zhang;Zhihui Zhang;Shujun Li;Chunyu Liu;Liang Shen;Wenbin Guo;S. Ruan
以二氯甲基二甲基氯硅烷（DCS）为阴极缓冲层，对二氧化钛（TiO 2）进行了可重复的硅烷化改性，以提高电子引出性能。通过将DCS覆盖层并入聚合物太阳能电池（PSC）中，可以增强器件的界面相干性，导致纳米微晶尺寸的变化和更小的内部电荷传输电阻。此外，TiO 2/DCS复合界面层可以作为激子解离中心和电荷转移通道，降低了能垒和电子损失，改善了TiO 2界面层的空穴阻挡和表面态钝化。Kelvin探针测试表明，DCS纳米层的引入降低了TiO 2的导带能量，在TiO 2与DCS纳米层的界面形成了一个偶极层，从而调节了器件的功函数，进一步增强了电极与活性层之间的载流子转移.结果，PSC的光电流和填充因子都增加，导致6.959%的功率转换效率（PCE）增加。
The reproducible silylation of titanium oxide (TiO2) with small molecular (dichloromethyl) dimethylchlorosilane (DCS) as the cathode buffer layer was developed to improve electron extraction. Through incorporating the DCS capping layer into polymer solar cells (PSCs), the interfacial coherence of devices could be enhanced, leading to a shift in nanocrystallite size and a smaller internal charge transport resistance. Furthermore, a TiO2/DCS combined interfacial layer could serve as both an exciton dissociation center and a charge transfer channel, which results in a reduction in the energy barrier and electron loss, improving hole-blocking and surface-state passivation in the TiO2 interfacial layer. The Kelvin probe measurements demonstrate that the employment of the DCS nanolayer decreases conduction band energy of TiO2via forming a dipole layer at the interface of TiO2 and the DCS nanolayer, which tunes the work-function of the device and ulteriorly enhances charge carrier transfer between the electrode and the active layer. As a result, the photocurrent and the fill factor of the PSCs are both increased, resulting in an increased power conversion efficiency (PCE) of 6.959%.