D-A type polymers based on quinoxaline unit containing halogenated thiophene side chain as hole transport materials for efficient CsPbI2Br perovskite solar cells

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2024-10-29 DOI:10.1016/j.dyepig.2024.112516

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Abstract

The design and synthesis of hole-transport materials (HTMs) is a hot research topic in perovskite solar cells (PSCs) community. Thanks to the continuous optimization of polymer structures, dopant-free polymers as HTMs have achieved rapid development in PSCs over the past few years. In this study, two D-A type polymers, PBQ6 and PBQ9, are selected as HTMs for CsPbI₂Br all-inorganic PSCs. Both polymers have the same donor (D) unit of benzodithiophene (BDT) with fluorinated thiophene side chain, but different acceptor (A) unit, fluorinated thiophene for PBQ6 while chlorinated thiophene for PBQ9. Then, the impact of different halogen substitutions on the optical and electrical properties of the polymer HTMs and the photovoltaic performance are investigated. Compared to PBQ6, PBQ9 demonstrates better energy level alignment with CsPbI₂Br, more efficient carrier extraction and transportation, and enhanced suppression of non-radiative losses. Consequently, CsPbI₂Br PSCs based on PBQ9-HTM achieve a higher power conversion efficiency (PCE) of 16.41 % compared to those based on PBQ6-HTM, which exhibit a PCE of 14.93 %. This study underscores the rational side chain engineering on A unit for D-A type polymer can improve the performance of HTMs, thereby further enhancing the efficiency of PSCs.

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基于含有卤代噻吩侧链的喹喔啉单元的 D-A 型聚合物，作为高效 CsPbI2Br 包晶太阳能电池的空穴传输材料

空穴传输材料（HTMs）的设计与合成是过氧化物太阳能电池（PSCs）界的热门研究课题。得益于聚合物结构的不断优化，无掺杂聚合物 HTM 在过去几年中在 PSC 中得到了快速发展。本研究选择了 PBQ6 和 PBQ9 这两种 D-A 型聚合物作为 CsPbI2Br 无机 PSC 的 HTM。这两种聚合物具有相同的供体（D）单元苯并二噻吩（BDT）和氟化噻吩侧链，但受体（A）单元不同，PBQ6 为氟化噻吩，而 PBQ9 为氯化噻吩。然后，研究了不同卤素取代对聚合物 HTM 的光学和电学特性以及光伏性能的影响。与 PBQ6 相比，PBQ9 与 CsPbI2Br 的能级一致性更好，载流子萃取和传输效率更高，对非辐射损耗的抑制也更强。因此，与基于 PBQ6-HTM 的 CsPbI2Br PSCs（PCE 为 14.93%）相比，基于 PBQ9-HTM 的 CsPbI2Br PSCs 的功率转换效率（PCE）高达 16.41%。这项研究表明，对 D-A 型聚合物的 A 单元进行合理的侧链工程可改善 HTM 的性能，从而进一步提高 PSC 的效率。

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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.