Zhang Xiaoliang, Liu Jianhua, Zhang Jindan, Vlachopoulos Nick, Johansson Erik M J
Department of Chemistry-Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden.
Phys Chem Chem Phys. 2015 May 21;17(19):12786-95. doi: 10.1039/c4cp06068g.
A solid-state environmentally friendly Ag2S quantum dot-sensitized solar cell (QDSSC) is demonstrated. The photovoltaic device is fabricated by applying ZnO@Ag2S core-shell nanowire arrays (NWAs) as light absorbers and electron conductors, and poly-3-hexylthiophene (P3HT) as a solid-state hole conductor. Ag2S quantum dots (QDs) were directly grown on the ZnO nanowires by the successive ionic layer adsorption and reaction (SILAR) method to obtain the core-shell nanostructure. The number of SILAR cycles for QD formation and the length of the core-shell NWs significantly affect the photocurrent. The device with a core-shell NWAs photoanode shows a power conversion efficiency increase by 32% compared with the device based on a typical nanoparticle-based photoanode with Ag2S QDs. The enhanced performance is attributed to enhanced collection of the photogenerated electrons utilizing the ZnO nanowire as an efficient pathway for transporting the photogenerated electrons from the QD to the contact.
展示了一种固态环境友好型硫化银量子点敏化太阳能电池（QDSSC）。该光电器件通过应用氧化锌@硫化银核壳纳米线阵列（NWAs）作为光吸收体和电子导体，以及聚-3-己基噻吩（P3HT）作为固态空穴导体来制造。通过连续离子层吸附和反应（SILAR）方法将硫化银量子点（QDs）直接生长在氧化锌纳米线上，以获得核壳纳米结构。用于量子点形成的SILAR循环次数和核壳纳米线的长度显著影响光电流。与基于典型的含硫化银量子点的纳米颗粒光阳极的器件相比，具有核壳纳米线阵列光阳极的器件功率转换效率提高了32%。性能的增强归因于利用氧化锌纳米线作为将光生电子从量子点传输到接触点的有效途径，从而增强了对光生电子的收集。
