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Comparative Studies on the Structure–Performance Relationships of Phenothiazine-Based Organic Dyes for Dye-Sensitized Solar Cells
ACS Omega ( IF 3.7 ) Pub Date : 2021-03-04 , DOI: 10.1021/acsomega.0c05887 Shengzhong Li 1 , Jingwen He 1 , Huiyun Jiang 2 , Shu Mei 1 , Zhenguang Hu 1 , Xiangfei Kong 1 , Miao Yang 3 , Yongzhen Wu 2 , Shuhua Zhang 4 , Haijun Tan 1
ACS Omega ( IF 3.7 ) Pub Date : 2021-03-04 , DOI: 10.1021/acsomega.0c05887 Shengzhong Li 1 , Jingwen He 1 , Huiyun Jiang 2 , Shu Mei 1 , Zhenguang Hu 1 , Xiangfei Kong 1 , Miao Yang 3 , Yongzhen Wu 2 , Shuhua Zhang 4 , Haijun Tan 1
Affiliation
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A D–A−π–A dye (PTZ-5) has been synthesized by introducing a benzothiadiazole (BTD) unit as an auxiliary acceptor in a phenothiazine-based D−π–A dye(PTZ-3) to broaden its spectral response range and improve the device performance. Photophysical properties indicate that the inclusion of BTD in the PTZ-5 effectively red-shifted the absorption spectra by reducing the Egap. However, the device measurements show that the open-circuit voltage (Voc) of PTZ-5 cell (640 mV) is obviously lower than that of the PTZ-3 cell (710 mV). This results in a poor photoelectric conversion efficiency (PCE) (4.43%) compared to that of PTZ-3 cell (5.53%). Through further comparative analysis, we found that the introduction of BTD increases the dihedral angle between the D and A unit, which can reduce the efficiency of intramolecular charge transfer (ICT), lead to a less qCT and lower molar extinction coefficient of PTZ-5. In addition, the ESI test found that the lifetime of the electrons in the PTZ-5 cell is shorter. These are the main factors for the above unexpected result of PCE. Our studies bring new insights into the development of phenothiazine-based highly efficient dye-sensitized solar cells (DSSCs).
中文翻译：
染料敏化太阳能电池中基于吩噻嗪的有机染料的结构-性能关系的比较研究
通过在基于吩噻嗪的D-π-A染料（PTZ-3）中引入苯并噻二唑（BTD）单元作为辅助受体来合成AD-A-π-A染料（PTZ-5），以扩大其光谱响应范围并提高设备性能。光物理性质表明，PTZ-5中包含的BTD可通过减小E间隙有效地使吸收光谱红移。但是，器件测量结果显示，PTZ-5电池的开路电压（oc）（640 mV）明显低于PTZ-3电池的开路电压（V oc）（710 mV）。与PTZ-3相比，这导致较差的光电转换效率（PCE）（4.43％）单元格（5.53％）。通过进一步的比较分析，我们发现引入BTD会增加D和A单元之间的二面角，这会降低分子内电荷转移（ICT）的效率，导致q CT值降低和PTZ-的摩尔消光系数降低。5。此外，ESI测试发现PTZ-5电池中电子的寿命较短。这些是导致PCE出现上述意外结果的主要因素。我们的研究为基于吩噻嗪的高效染料敏化太阳能电池（DSSC）的开发带来了新的见识。
更新日期：2021-03-16
中文翻译：
染料敏化太阳能电池中基于吩噻嗪的有机染料的结构-性能关系的比较研究
通过在基于吩噻嗪的D-π-A染料（PTZ-3）中引入苯并噻二唑（BTD）单元作为辅助受体来合成AD-A-π-A染料（PTZ-5），以扩大其光谱响应范围并提高设备性能。光物理性质表明，PTZ-5中包含的BTD可通过减小E间隙有效地使吸收光谱红移。但是，器件测量结果显示，PTZ-5电池的开路电压（oc）（640 mV）明显低于PTZ-3电池的开路电压（V oc）（710 mV）。与PTZ-3相比，这导致较差的光电转换效率（PCE）（4.43％）单元格（5.53％）。通过进一步的比较分析，我们发现引入BTD会增加D和A单元之间的二面角，这会降低分子内电荷转移（ICT）的效率，导致q CT值降低和PTZ-的摩尔消光系数降低。5。此外，ESI测试发现PTZ-5电池中电子的寿命较短。这些是导致PCE出现上述意外结果的主要因素。我们的研究为基于吩噻嗪的高效染料敏化太阳能电池（DSSC）的开发带来了新的见识。
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