The amino substituted 1,4-naphthoquinone photosensitizers, viz; BrA5; 2-bromo-3-(pentylamino)naphthalene-1,4-dione, BrA6; 2-bromo-3-(hexylamino)naphthalene-1,4-dione, BrA7; 2-bromo-3-(heptylamino)naphthalene-1,4-dione, BrA8; 2-bromo-3-(octylamino)naphthalene-1,4-dione, have been synthesized from 2,3-dibromonaphthalene-1,4-dione. These photosensitizers were employed for the first time in TiO₂NG-based dye-sensitized solar cells (DSSCs). The TiO₂ nanograin (TiO₂NG) compact layer was prepared using chemical bath deposition to reduce the electron recombination. The porous layer of TiO₂NG was deposited using the doctor blade method, followed by calcination at 450 °C. After sensitization of BrA5, BrA6, BrA7, and BrA8 photosensitizers on the TiO₂NG photoelectrodes, the optical properties of photoelectrodes show the broad band each in the visible region, which is assigned to n → π* charge-transfer transition. FT-IR analysis of photosensitizers showed the existence of N–H bands. The XRD pattern of TiO₂NG photoanode confirmed the anatase and rutile phase. The E_0-0 and HOMO–LUMO energy levels were calculated using UV–visible, fluorescence spectroscopy, and cyclic voltammetry, respectively. The E_0-0 of BrA5 and BrA7 is 2.35 eV, while that of BrA6 and BrA8 is 2.33 eV. The DSSCs system is fabricated by loading the BrA5, BrA6, BrA7, and BrA8 photosensitizers on TiO₂NGs. The photosensitizer's photovoltaic performances of TiO₂NG-based electrodes were studied through electrochemical impedance analysis. The J–V curve analysis and characterization show that the efficient light absorption and reduction of charge recombination at the TiO₂NG photoanodes are the main reasons for the efficiency of the TiO₂NG/BrA5, TiO₂NG/BrA6, TiO₂NG/BrA7, and TiO₂NG/BrA8 photoelectrodes. Compared to DSSCs employing other photosensitizers (BrA5, BrA6, and BrA7) on a TiO₂NG photoelectrode (TiO₂NG/BrA5 (0.33%), TiO₂NG/BrA6 (0.35%), TiO₂NG/BrA7 (0.36%), those using BrA8 demonstrate higher power conversion efficiencies. Specifically, TiO₂NG/BrA8 shows the highest efficiency at 0.43%. The enhanced performance of the TiO₂NG/BrA8-based DSSC can be attributed to its increased dye loading and rapid electron injection. The present study will open a new route to fabricate highly efficient DSSCs using amino-substituted 1,4-naphthoquinone photosensitizers.

氨基取代的1,4-萘醌光敏剂，即； BrA5; 2-溴-3-(戊氨基)萘-1,4-二酮，BrA6； 2-溴-3-(己氨基)萘-1,4-二酮，BrA7； 2-溴-3-(庚氨基)萘-1,4-二酮，BrA8； 2-溴-3-(辛氨基)萘-1,4-二酮是由2,3-二溴萘-1,4-二酮合成的。这些光敏剂首次应用于 TiO ₂ NG 基染料敏化太阳能电池 (DSSC)。采用化学浴沉积法制备了 TiO ₂ 纳米颗粒（TiO ₂ NG）致密层，以减少电子复合。使用刮刀法沉积TiO ₂ NG的多孔层，然后在450℃下煅烧。 TiO ₂ NG光电极上的BrA5、BrA6、BrA7和BrA8光敏剂敏化后，光电极的光学特性在可见光区域显示出宽带，该宽带被分配给n → π*电荷-转移过渡。光敏剂的 FT-IR 分析显示 N-H 谱带的存在。 TiO ₂ NG光阳极的XRD图谱证实了锐钛矿和金红石相。 E _0-0 和 HOMO-LUMO 能级分别使用紫外可见光、荧光光谱和循环伏安法计算。 BrA5和BrA7的E _0-0 为2.35eV，而BrA6和BrA8的E _0-0 为2.33eV。 DSSC 系统是通过在 TiO ₂ NG 上负载 BrA5、BrA6、BrA7 和 BrA8 光敏剂而制成的。通过电化学阻抗分析研究了光敏剂TiO ₂ NG基电极的光伏性能。 J-V曲线分析和表征表明，TiO ₂ NG光阳极的高效光吸收和电荷复合的减少是TiO ₂ NG/效率的主要原因。 BrA5、TiO ₂ NG/BrA6、TiO ₂ NG/BrA7 和 TiO ₂ NG/BrA8 光电极。与在 TiO ₂ NG 光电极上使用其他光敏剂（BrA5、BrA6 和 BrA7）的 DSSC 相比（TiO ₂ NG/BrA5 (0.33%)、TiO ₂ NG/BrA6 (0.35%)、TiO ₂ NG/BrA7 (0.36%)，使用 BrA8 的功率转换效率更高，具体而言，TiO ₂ NG/BrA8 表现出最高。 TiO ₂ NG/BrA8 基 DSSC 的效率提高可归因于其染料负载量的增加和快速电子注入，本研究将为制造高效 DSSC 开辟一条新途径。使用氨基取代的1,4-萘醌光敏剂。