基于金颗粒自组装烷基硫醇为缓冲层的有机太阳能电池

有机活性层和无机电极的界面修饰影响到有机太阳能电池性能。本文引入金纳米颗粒自组装烷基硫醇，改善有机/无机的界面。制备“ITO/金颗粒-硫醇自组装缓冲层/聚3-己基噻吩(P3HT)∶6,6]-苯基-C61-丁酸甲酯(PCBM)/LiF/Al电极”结构的器件。自组装硫醇防止了因金颗粒与活性层直接接触导致的激子猝灭效应。我们研究了金纳米颗粒自组装不同链长的烷基硫醇对器件性能的影响，烷基硫醇的烷基链越长，硫醇对金颗粒的覆盖性越好，器件的短路电流越高。金纳米颗粒自组装十二烷基硫醇，短路电流J_SC由5.19 mA·cm-2提升到6.24 mA·cm-2，提高了20%。

Organic Solar Cell Based On Alkylthiol/Au Self-assembly Film As Buffer Layer

The interface modification between the organic active layer and the inorganic electrode affects the performance of organic solar cell (OSC). A buffer layer of alkylthiol(ethanethiol, hexanethiol, dodecanethiol) /Au self-assembly layer was introduced into OSC to substitute Poly(3,4-ethylenedioxythiophene)∶poly(styrene sulfonate) (PEDOT∶PSS) layer, in order to improve the organic/inorganic interface. We fabricated devices with structure of “ITO/Au (annealed Au film of 2 nm)-thiol self assembly layer/ poly(3-hexylthiophene)∶1-(3-methoxycarbonyl) -propyl-1-phenyl-(6,6)C61(P3HT∶PCBM) /LiF/Al”. After alkanethiol self-assembling, the alkanethiol prevented exciton quenching owe to direct contact between the Au NPs and the active layer.We studied the impact of alkanethiol with different chain length on device performance. With?the?growth?of?the?alkyl chain, the coverage of the thiol on Au NPs got better, and the device performance become better. In the OSC with dodecanethiol /Au (2 nm Au film annealed) self-assembly film, the short-circuit current increases from 5.19 mA·cm-2 to 6.24 mA·cm-2.