Enhanced Photovoltaic Performances of Dye-Sensitized Solar Cells by Co-Sensitization of Benzothiadiazole and Squaraine-Based Dyes
详细信息 查看全文
- 作者：Ashraful Islam ; Md. Akhtaruzzaman ; Towhid H. Chowdhury ; Chuanjiang Qin ; Liyuan Han ; Idriss M. Bedja ; Romain Stalder ; Kirk S. Schanze ; John R. Reynolds
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：February 24, 2016
- 年：2016
- 卷：8
- 期：7
- 页码：4616-4623
- 全文大小：400K
- ISSN：1944-8252
文摘
Dye-sensitized solar cells (DSSCs) based on a donor–acceptor–donor oligothienylene dye containing benzothiadiazole (T4BTD-A) were cosensitized with dyes containing cis-configured squaraine rings (HSQ3 and HSQ4). The cosensitized dyes showed incident monochromatic photon-to-current conversion efficiency (IPCE) greater than 70% in the 300–850 nm wavelength region. The individual overall conversion efficiencies of the sensitizers T4BTD-A, HSQ3, and HSQ4 were 6.4%, 4.8%, and 5.8%, respectively. Improved power conversion efficiencies of 7.0% and 7.7% were observed when T4BTD-A was cosensitized with HSQ3 and HSQ4, respectively, thanks to a significant increase in current density (JSC) for the cosensitized DSSCs. Intensity-modulated photovoltage spectroscopy results showed a longer lifetime for cosensitized T4BTD-A+HSQ3 and T4BTD-A+HSQ4 compared to that of HSQ3 and HSQ4, respectively.