Analysis of the Efficiency Losses in Hybrid Perovskite/PTAA Solar Cells with Different Molecular Weights: Morphology versus Kinetics,ACS Applied Energy Materials

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Analysis of the Efficiency Losses in Hybrid Perovskite/PTAA Solar Cells with Different Molecular Weights: Morphology versus Kinetics
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-05-15 00:00:00 , DOI: 10.1021/acsaem.0c00956
Narges Yaghoobi Nia ₁ , Maria Méndez ₂ , Barbara Paci ₃ , Amanda Generosi ₃ , Aldo Di Carlo _{1,

4} , Emilio Palomares _{2,

5}

Affiliation

The PTAA polymer (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]) is often used as a hole transport material (HTM) for high-efficiency perovskite solar cells (PSCs). However, there are great differences within the solar cell efficiencies reported. Herein, we show that when increasing PTAA molecular weight (MW) from 10 to 115 kDa, the power conversion efficiency also increases. We analyze how the differences in MW influence the interfacial carrier losses in the PSCs under operando conditions using advanced photoinduced spectroscopic techniques. Moreover, we compare kinetics and structural/morphological effects by studying different PTAA MW films. Our results show that the observed differences within the reported PSC efficiencies are due to the differences in carrier recombination kinetics, which are influenced by the differences in the polymer MW.

中文翻译：

不同分子量的钙钛矿/ PTAA杂化混合太阳能电池效率损失分析：形态与动力学

PTAA聚合物（聚[双（4-苯基）（2,4,6-三甲基苯基）胺]）通常用作高效钙钛矿太阳能电池（PSC）的空穴传输材料（HTM）。但是，报告的太阳能电池效率存在很大差异。在此，我们表明，当将PTAA分子量（MW）从10 kDa增加到115 kDa时，功率转换效率也会提高。我们使用先进的光诱导光谱技术分析了在操作条件下，MW的差异如何影响PSC中的界面载流子损失。此外，我们通过研究不同的PTAA MW薄膜来比较动力学和结构/形态学效应。我们的结果表明，在报告的PSC效率范围内观察到的差异是由于载流子重组动力学的差异所致，而载流子重组动力学的差异受聚合物MW差异的影响。

更新日期：2020-05-15

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