Size dependence of photovoltaic properties and surface states modulation in ZnO nanowire/poly（3-hexylthiophene） hybrid nanostructures

• Published in: 中国科学通报：英文版 2016 (3), p.245-251
• Main Author: Yuqian Huang Ke Cheng Jingjing Liu Ming Xue Zhongcheng Kuang Zuliang Du
• Format: Article
• Language: English
• Subjects: 3-己基噻吩; 光电性能; 复合膜; 无机/有机; 氧化锌纳米线; 纳米结构; 表面态; 调制
• ISSN: 1001-6538; 1861-9541

An appropriate diameter and wire-to-wire dis- tance is critical for optimizing the performance of hybrid inorganic/organic photovoltaic devices. For a deep under- standing of their influences on such hybrid structures, the well-ordered ZnO nanowires with different diameters are fabricated by the versatile hydrothermal growth. The dependence of the photovoltaic performance on the surface states, wire diameter and wire-to-wire distance is investi- gated. We demonstrate that the pristine thick ZnO nanowires film possess a higher surface photovoltage （SPV） response than the thin one. This is mainly due to the influence of surface states on the thin ZnO nanowires, which can capture the photo-generated carriers. When the two kinds of ZnO nanowires are fabricated into a hybrid inorganic/organic structure, the thin ZnO nanowires/poly（3-hexylthiophene） hybrid film has a higher SPV response than the thick one, which is contrary to the pristine ZnO nanowires. This is benefited from the smaller diameter and wire-to-wire dis- tance of the thin ZnO nanowires owned. The crystallinity, wire diameter and wire-to-wire distance have the crucial influence on the final photovoltaic performance. The results shown here give us insights toward designing efficient hybrid photovoltaic devices.