Perovskite Solar Cells with an SbX3 (X = Cl, I) Interface Dipole Layer,ACS Materials Letters

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Perovskite Solar Cells with an SbX3 (X = Cl, I) Interface Dipole Layer
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-06-15 , DOI: 10.1021/acsmaterialslett.3c00241
Huimin Pang _{1,

2} , Mingxuan Guo _{1,

2} , Xingtong Chen _{1,

2} , Xueqing Xia _{1,

2} , Xiaojuan Sun _{1,

2} , Wenlin Xia ₃ , Hengfei Shi ₃ , Yu Chen ₃ , Song Chen _{1,

2}

Affiliation

Forming an interface dipole moment pointing from the absorber to the oxide substrate can improve the open-circuit voltage (V_OC) of perovskite solar cells (PSCs) without affecting photocurrent. In past studies, however, interface dipole layers were generally formed using organic self-assembled monolayers or polyelectrolytes, which raises concerns about intrinsic stability. Meanwhile, perovskites’ substrate-dependent electronic properties question the apparent correlation between the oxide’s work function and the built-in voltage. In this work, we propose an interface dipole layer based on solution-processable metal halides, which increases the built-in voltage of the n–i–p diode by simultaneously reducing the electron transport layer’s work function and strengthening the n-type characteristics of the perovskite absorber. The n–i–p-structured PSCs with the SbX₃ dipole layer achieve substantially enhanced V_OC (1.171 V) and power conversion efficiency (23.11%). Further experiments and calculations confirm that the proposed dipole model can explain the V_OC enhancement qualitatively and quantitatively.

中文翻译：

具有 SbX3 (X = Cl, I) 界面偶极层的钙钛矿太阳能电池

_{形成从吸收体指向氧化物衬底的}界面偶极矩可以提高开路电压（VOC）的钙钛矿太阳能电池（PSC）而不影响光电流。然而，在过去的研究中，界面偶极层通常是使用有机自组装单层或聚电解质形成的，这引起了人们对内在稳定性的担忧。与此同时，钙钛矿依赖于基底的电子特性对氧化物的功函数和内建电压之间的明显相关性提出了质疑。在这项工作中，我们提出了一种基于可溶液加工的金属卤化物的界面偶极子层，它通过同时降低电子传输层的功函数并增强n型特性来增加n-i-p二极管的内建电压。钙钛矿吸收剂。_具有SbX ₃偶极层的 n-i-p 结构 PSC 大幅提高了VOC(1.171 V) 和电源转换效率 (23.11%)。进一步的实验和计算证实，所提出的偶极子模型可以定性和定量地解释VOC_的增强。

更新日期：2023-06-15

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