Lv Chunzheng, He Lirong, Tang Jiahong, Yang Feng, Zhang Chuhong
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China.
Superconductivity and New Energy R&D Center (SRDC), Key Laboratory of Advanced Technology of Materials (Ministry of Education of China), Southwest Jiaotong University, Chengdu, 610031, China.
Nanoscale Res Lett. 2021 Mar 17;16(1):48. doi: 10.1186/s11671-021-03504-3.
As an important photoconductive hybrid material, perylene/ZnO has attracted tremendous attention for photovoltaic-related applications, but generally faces a great challenge to design molecular level dispersed perylenes/ZnO nanohybrids due to easy phase separation between perylenes and ZnO nanocrystals. In this work, we reported an in-situ reaction method to prepare molecular level dispersed H-aggregates of perylene bisimide/ZnO nanorod hybrids. Surface photovoltage and electric field-induced surface photovoltage spectrum show that the photovoltage intensities of nanorod hybrids increased dramatically for 100 times compared with that of pristine perylene bisimide. The enhancement of photovoltage intensities resulting from two aspects: (1) the photo-generated electrons transfer from perylene bisimide to ZnO nanorod due to the electric field formed on the interface of perylene bisimide/ZnO; (2) the H-aggregates of perylene bisimide in ZnO nanorod composites, which is beneficial for photo-generated charge separation and transportation. The introduction of ordered self-assembly thiol-functionalized perylene-3,4,9,10-tetracarboxylic diimide (T-PTCDI)/ ZnO nanorod composites induces a significant improvement in incident photo-to-electron conversion efficiency. This work provides a novel mentality to boost photo-induced charge transfer efficiency, which brings new inspiration for the preparation of the highly efficient solar cell.
作为一种重要的光电导混合材料，苝/氧化锌在光伏相关应用中引起了极大关注，但由于苝与氧化锌纳米晶体之间容易发生相分离，在设计分子水平分散的苝/氧化锌纳米杂化物方面通常面临巨大挑战。在这项工作中，我们报道了一种原位反应方法来制备分子水平分散的苝双酰亚胺/氧化锌纳米棒杂化物的H-聚集体。表面光电压和电场诱导表面光电压光谱表明，与原始苝双酰亚胺相比，纳米棒杂化物的光电压强度急剧增加了100倍。光电压强度的增强源于两个方面：（1）由于苝双酰亚胺/氧化锌界面形成的电场，光生电子从苝双酰亚胺转移到氧化锌纳米棒；（2）苝双酰亚胺在氧化锌纳米棒复合材料中的H-聚集体，这有利于光生电荷的分离和传输。有序自组装硫醇功能化苝-3,4,9,10-四羧酸二亚胺（T-PTCDI）/氧化锌纳米棒复合材料的引入显著提高了入射光到电子的转换效率。这项工作为提高光致电荷转移效率提供了一种新的思路，为制备高效太阳能电池带来了新的启发。
