SAM Molecular Stacking with Heterogeneous Orientationfor High-Performance Perovskite Photovoltaics
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915883032510464 |
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| author | Huang, Lei Wang, Kai-Li Chen, Zhang Zhen-Huang Murodzoda, Saidjafar Chen, Xin Chen, Jing Chen, Chun-Hao Xia, Yu Yang, Yu-Tong Li, Jia-Cheng Nematov, Dilshod Yavuz, Ilhan Wang, Zhao-Kui |
| author_facet | Huang, Lei Wang, Kai-Li Chen, Zhang Zhen-Huang Murodzoda, Saidjafar Chen, Xin Chen, Jing Chen, Chun-Hao Xia, Yu Yang, Yu-Tong Li, Jia-Cheng Nematov, Dilshod Yavuz, Ilhan Wang, Zhao-Kui |
| contents | This study demonstrates that thermal-evaporated SAM (eSAM) films, particularly in a thick configuration, spontaneously adopt a heterogeneous molecular orientation, forming a vertical-to-horizontal gradient in molecular packing. This unique architecture establishes a graded energy barrier, which is shown to facilitate more efficient hole transport compared with the single energy barrier presented by conventional thin SAMs. In conclusion, while solution-processed SAMs present formidable scalability challenges, the thermal evaporation of SAMs offers a viable pathway toward industrial-scale fabrication. The strategy of employing thick eSAM films with gradient molecular packing not only circumvents the uniformity issues of solution methods but also introduces a superior structure for charge transport, positioning it as a promising enabler for the commercialization of high-efficiency perovskite photovoltaics. The inability to achieve uniform hole transport with solution-processed self-assembled monolayers (SAMs) constitutes a fundamental bottleneck for scaling perovskite photovoltaics. Herein, we demonstrate that thermal-evaporated SAMs (eSAMs) overcome this limitation by enabling precise thickness control. Crucially, a thickened eSAM spontaneously forms a vertical-to-horizontal gradient in molecular orientation, which creates a descending energy barrier that directionally facilitates hole transport. This tailored interface also ensures excellent surface coverage and directs the growth of high-quality perovskite films. Consequently, the resultant photovoltaic devices set new benchmarks, delivering impressive power conversion efficiencies (PCEs) of 21.46% (small-area, 0.108 cm2) and 19.38% (large-area module, 15.52 cm2) for fully vacuum-evaporated devices, while also setting an impressive PCE of 23.67% for eSAM-based devices with solution-processed perovskites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21657 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | SAM Molecular Stacking with Heterogeneous Orientationfor High-Performance Perovskite Photovoltaics Huang, Lei Wang, Kai-Li Chen, Zhang Zhen-Huang Murodzoda, Saidjafar Chen, Xin Chen, Jing Chen, Chun-Hao Xia, Yu Yang, Yu-Tong Li, Jia-Cheng Nematov, Dilshod Yavuz, Ilhan Wang, Zhao-Kui Materials Science This study demonstrates that thermal-evaporated SAM (eSAM) films, particularly in a thick configuration, spontaneously adopt a heterogeneous molecular orientation, forming a vertical-to-horizontal gradient in molecular packing. This unique architecture establishes a graded energy barrier, which is shown to facilitate more efficient hole transport compared with the single energy barrier presented by conventional thin SAMs. In conclusion, while solution-processed SAMs present formidable scalability challenges, the thermal evaporation of SAMs offers a viable pathway toward industrial-scale fabrication. The strategy of employing thick eSAM films with gradient molecular packing not only circumvents the uniformity issues of solution methods but also introduces a superior structure for charge transport, positioning it as a promising enabler for the commercialization of high-efficiency perovskite photovoltaics. The inability to achieve uniform hole transport with solution-processed self-assembled monolayers (SAMs) constitutes a fundamental bottleneck for scaling perovskite photovoltaics. Herein, we demonstrate that thermal-evaporated SAMs (eSAMs) overcome this limitation by enabling precise thickness control. Crucially, a thickened eSAM spontaneously forms a vertical-to-horizontal gradient in molecular orientation, which creates a descending energy barrier that directionally facilitates hole transport. This tailored interface also ensures excellent surface coverage and directs the growth of high-quality perovskite films. Consequently, the resultant photovoltaic devices set new benchmarks, delivering impressive power conversion efficiencies (PCEs) of 21.46% (small-area, 0.108 cm2) and 19.38% (large-area module, 15.52 cm2) for fully vacuum-evaporated devices, while also setting an impressive PCE of 23.67% for eSAM-based devices with solution-processed perovskites. |
| title | SAM Molecular Stacking with Heterogeneous Orientationfor High-Performance Perovskite Photovoltaics |
| topic | Materials Science |
| url | https://arxiv.org/abs/2603.21657 |