Zhao Lu, Ma Tai, Bai Hua, Lu Gewu, Li Chun, Shi Gaoquan
Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing, People's Republic of China.
Langmuir. 2008 Apr 15;24(8):4380-7. doi: 10.1021/la703884d. Epub 2008 Mar 7.
Multilayer films of oligo(pyrenebutyric acid) (OPB) and N,N'-bis(N,N-dimethylaminopropylaminopropyl)-3,4,9,10-perylenediimide (BDMAPAP-PDI) were successfully fabricated by layer-by-layer deposition. Multilayer growth was monitored by ultraviolet-visible (UV-vis) spectroscopy, fluorescence spectroscopy, ellipsometry, and atomic force microscopy (AFM). It was found that extraction was scarcely observed although both components (OPB and BDMAPAP-PDI) have low molecular weights and both electrostatic interactions and pi-pi stacking contributed to the multilayer deposition. The multilayers exhibit a rapid photocurrent response, and excitations of both OPB and BDMAPAP-PDI can lead to the effective charge dissociation. The incident photon to current conversion efficiency (IPCE) of the composite film with 5 bilayers was measured to be 1.29% at the absorption peak of BDMAPAP-PDI. Fluorescence quenching and photovoltaic conversion studies indicated that strong photoinduced charge transfer interactions occurred at the area of OPB/BDMAPAP-PDI heterojunction in the films, which strongly enhanced the photoresponse of the multilayer films.
通过层层沉积法成功制备了聚（芘丁酸）（OPB）和N，N'-双（N，N-二甲基氨基丙基氨基丙基）-3，4，9，10-苝二酰亚胺（BDMAPAP-PDI）的多层膜。通过紫外-可见（UV-vis）光谱、荧光光谱、椭偏仪和原子力显微镜（AFM）监测多层膜的生长。发现尽管两种组分（OPB和BDMAPAP-PDI）分子量较低，且静电相互作用和π-π堆积都有助于多层沉积，但几乎未观察到萃取现象。多层膜表现出快速的光电流响应，OPB和BDMAPAP-PDI的激发都能导致有效的电荷解离。在BDMAPAP-PDI的吸收峰处，5个双层的复合膜的入射光子到电流转换效率（IPCE）测得为1.29%。荧光猝灭和光伏转换研究表明，在薄膜中OPB/BDMAPAP-PDI异质结区域发生了强烈的光致电荷转移相互作用，这极大地增强了多层膜的光响应。
