Exploring the Stability of Novel Wide Bandgap Perovskites by a Robot Based High Throughput Approach |
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Authors: | Shi Chen Yi Hou Haiwei Chen Xiaofeng Tang Stefan Langner Ning Li Tobias Stubhan Ievgen Levchuk Ening Gu Andres Osvet Christoph J. Brabec |
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Affiliation: | 1. Institute of Materials for Electronics and Energy Technology (i‐MEET), Department of Materials Science and Engineering, Friedrich‐Alexander University Erlangen‐Nürnberg, Erlangen, Germany;2. Erlangen Graduate School in Advanced Optical Technologies (SAOT), Erlangen, Germany;3. Bavarian Center for Applied Energy Research (ZAE Bayern), Erlangen, Germany |
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Abstract: | Currently, lead‐based perovskites with mixed multiple cations and hybrid halides are attracting intense research interests due to their promising stability and high efficiency. A tremendous amount of 3D and 2D perovskite compositions and configurations are causing a strong demand for high throughput synthesis and characterization. Furthermore, wide bandgap (≈1.75 eV) perovskites as promising top‐cell materials for perovskite–silicon tandem configurations require the screening of different compositions to overcome photoinduced halide segregation and still yielding a high open‐circuit voltage (Voc). Herein, a home‐made high throughput robot setup is introduced performing automatic perovskite synthesis and characterization. Subsequently, four kinds of compositions (i.e., cation mixtures of Cs–methylammonium (MA), Cs– formamidinium (FA), MA–FA, and FA–MA) with an optical bandgap of ≈1.75 eV are identified as promising device candidates. For Cs–MA and Cs–FA films it is found that the Br–I phase segregation indeed can be overcome. Moreover, Cs–MA, MA–FA, and Cs–FA based devices exhibit an average Voc of 1.17, 1.17, 1.12 V, and their maximum values approached 1.18, 1.19, 1.14 V, respectively, which are among the highest Voc (≈1.2 V) values for ≈40% Br perovskite. These findings highlight that the high throughput approach can effectively and efficiently accelerate the invention of novel perovskites for advanced applications. |
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Keywords: | high throughput approach open‐circuit voltage photoinduced phase segregation wide bandgap perovskites |
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