Enhancing Thermal Stability of Perovskite Solar Cells through Thermal Transition and Thin Film Crystallization Engineering of Polymeric Hole Transport Layers,ACS Energy Letters

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Enhancing Thermal Stability of Perovskite Solar Cells through Thermal Transition and Thin Film Crystallization Engineering of Polymeric Hole Transport Layers
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-08-22 , DOI: 10.1021/acsenergylett.4c01546
Sanggyun Kim ₁ , Sina Sabury ₂ , Carlo A R Perini ₁ , Tareq Hossain ₃ , Augustine O Yusuf ₃ , Xiangyu Xiao ₁ , Ruipeng Li ₄ , Kenneth R Graham ₃ , John R Reynolds _{1,

2} , Juan-Pablo Correa-Baena _{1,

2}

Affiliation

Organic hole transport layers (HTLs) have been known to be susceptible to thermal stress, leading to poor long-term stability in perovskite solar cells (PSCs). We synthesized three 2,5-dialkoxy-substituted, 1,4-bis(2-thienyl)phenylene (TPT)-based conjugated polymers (CPs) linked with thiophene-based (thiophene (T) and thienothiophene (TT)) comonomers and evaluated them as HTLs in n-i-p PSCs. TPT-T (MB/C6), which has branched 2-methylbutyl and linear hexyl (MB/C6) side chains, emerged as a promising HTL candidate, enabling power conversion efficiencies (PCEs) greater than 15%. In addition, PSCs with this HTL showed an improvement in long-term stability at elevated temperatures of 65 °C when compared to those with the state-of-art HTL, 2,2′,7,7′-tetrakis(N,N-p-dimethoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD). This improvement is ascribed to the lack of thermal transitions within the operational temperature range of PSCs for TPT-T (MB/C6), which is attributed to the relatively short branched side chains of this polymer. We propose that the elimination of thermal transitions below 200 °C leads to HTLs without cracking as-deposited and after conducting a stress test at 65 °C, which can serve as a new design guideline for HTL development.

中文翻译：

通过聚合物空穴传输层的热转变和薄膜结晶工程提高钙钛矿太阳能电池的热稳定性

众所周知，有机空穴传输层（HTL）容易受到热应力的影响，导致钙钛矿太阳能电池（PSC）的长期稳定性较差。我们合成了三种 2,5-二烷氧基取代的 1,4-双（2-噻吩基）亚苯基 (TPT) 基共轭聚合物 (CP)，与噻吩基（噻吩 (T) 和噻吩并噻吩 (TT)）共聚单体连接，将它们评估为压区 PSC 中的 HTL。 TPT-T (MB/C6) 具有支链 2-甲基丁基和直链己基 (MB/C6) 侧链，成为一种有前途的 HTL 候选材料，可使功率转换效率 (PCE) 大于 15%。此外，与采用最先进的 HTL、2,2',7,7'-tetrakis( N,Np -二甲氧基苯氨基）-9,9'-螺二芴（螺-OMeTAD）。这种改进归因于 TPT-T (MB/C6) 的 PSC 工作温度范围内缺乏热转变，这归因于该聚合物的支化侧链相对较短。我们建议，消除 200 °C 以下的热转变可以使 HTL 在沉积时且在 65 °C 下进行应力测试后不会开裂，这可以作为 HTL 开发的新设计指南。

更新日期：2024-08-22

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