Spectral complementarity of phenothiazine-based dyes with N719 and its application in double-sided Pt electrode tandem DSSCs

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-09-02 DOI:10.1016/j.dyepig.2025.113204

Qi Li , Weihao Li , Mengdan Yang , Shucheng Huang , Xiangfei Kong , Wenjun Wu , Haijun Tan

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Abstract

The classic N719 dye in dye-sensitized solar cells (DSSCs) exhibits insufficient spectral response in the 300–500 nm range. To address this limitation, a phenothiazine-based dye, PTZ-7, was designed by introducing an ethynyl group into PTZ-6 (a previously reported dye with partial spectral complementarity to N719 but significant overlap). Theoretical calculations revealed that this structural modification induced a redshift in the absorption spectrum, and experimental characterization confirmed that its absorption band extended to the 410–492 nm region, achieving improved spectral complementarity with N719. A tandem device architecture integrating N719 (top layer) and PTZ-7 (bottom layer) with dual-sided Pt counter electrodes was fabricated, demonstrating synergistic spectral enhancement. The optimized device exhibited a short-circuit current density (J_sc) of 20.09 mA cm⁻² and a power conversion efficiency (PCE) of 11.08 %, surpassing single-dye systems based solely on PTZ-7 (J_sc = 11.86 mA cm⁻², PCE = 6.47 %) or N719 (J_sc = 14.88 mA cm⁻², PCE = 8.52 %). This study demonstrates the effectiveness of a molecular engineering guided strategy combining spectral matching and tandem integration to overcome the performance limitations of DSSCs.

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吩噻嗪基染料与N719的光谱互补及其在双面Pt电极串联DSSCs中的应用

在染料敏化太阳能电池（DSSCs）中，经典的N719染料在300-500 nm范围内的光谱响应不足。为了解决这一限制，设计了一种基于吩噻嗪的染料PTZ-7，通过在PTZ-6（一种先前报道的与N719具有部分光谱互补但有显著重叠的染料）中引入乙基。理论计算表明，这种结构修饰引起了吸收光谱的红移，实验表征证实其吸收波段扩展到410 - 492nm区域，与N719实现了更好的光谱互补性。采用N719（顶层）和PTZ-7（底层）与双面Pt对电极的串联器件结构，实现了光谱协同增强。优化后的器件短路电流密度（Jsc）为20.09 mA cm−2，功率转换效率（PCE）为11.08%，超过了单独基于PTZ-7 （Jsc = 11.86 mA cm−2,PCE = 6.47%）或N719 （Jsc = 14.88 mA cm−2,PCE = 8.52%）的单染料系统。该研究证明了结合光谱匹配和串联集成的分子工程引导策略在克服DSSCs性能限制方面的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.