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Water-Free, Conductive Hole Transport Layer for Reproducible Perovskite–Perovskite Tandems with Record Fill Factor AITranslate

Md Arafat Mahmud; Jianghui Zheng; Shi Tang; Chwenhaw Liao; Guoliang Wang; Jueming Bing; Tik Lun Leung; Anh Dinh Bui; Hongjun Chen; Jianpeng Yi; Stephen P. Bremner; Hieu T. Nguyen; Anita W. Y. HoBaillie;
The University of Sydney; Macquarie University; The University of Sydney; The University of Sydney; The University of Sydney; The University of Sydney; The University of Sydney; The Australian National University; The University of Sydney; The University of Sydney; University of New South Wales; The Australian National University; University of New South Wales
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Abstract AITranslate

State-of-the-art perovskite–perovskite tandem solar cells incorporate a water-based poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) hole transport layer in its low bandgap subcell. However, there is a limitation regarding its use due to the moisture sensitivity of perovskites and the insulating property of PSS. Here, we overcome the limitation by using a water-free and PSS-free PEDOT-based hole transport layer for low bandgap single-junction perovskite solar cells and in perovskite–perovskite tandems. The champion tandem cell produces an efficiency of 21.5% and a fill factor of 85.8%, the highest for any perovskite-based double-junction tandems. Results of photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and conductive atomic force microscopy reveal evidence of enhanced conductivity of water-free and PSS-free PEDOT compared to its conventional counterpart. The use of water-free and PSS-free PEDOT also eliminates decomposition of high bandgap subcell with its interfacing layer stack in a tandem that otherwise occurs with conventional PEDOT:PSS. This leads to enhanced reproducibility of perovskite–perovskite tandems.

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DOI：https://doi.org/10.1021/acsenergylett.2c02164

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Citation Information:

State-of-the-art perovskite–perovskite tandem solar cells incorporate a water-based poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) hole transport layer in its low bandgap subcell. However, there is a limitation regarding its use due to the moisture sensitivity of perovskites and the insulating property of PSS. Here, we overcome the limitation by using a water-free and PSS-free PEDOT-based hole transport layer for low bandgap single-junction perovskite solar cells and in perovskite–perovskite tandems. The champion tandem cell produces an efficiency of 21.5% and a fill factor of 85.8%, the highest for any perovskite-based double-junction tandems. Results of photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and conductive atomic force microscopy reveal evidence of enhanced conductivity of water-free and PSS-free PEDOT compared to its conventional counterpart. The use of water-free and PSS-free PEDOT also eliminates decomposition of high bandgap subcell with its interfacing layer stack in a tandem that otherwise occurs with conventional PEDOT:PSS. This leads to enhanced reproducibility of perovskite–perovskite tandems.

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GB/T 7714-2015 [1] Md Arafat Mahmud, Jianghui Zheng, Shi Tang, et al. ACS Energy Letters, 2023(8). DOI:10.1021/acsenergylett.2c02164.
MLA [1] Md Arafat Mahmud, et al., ACS Energy Letters, no. 8, 2023, https://doi.org/10.1021/acsenergylett.2c02164.
APA [1] Md Arafat Mahmud, Jianghui Zheng, Shi Tang, Chwenhaw Liao, Guoliang Wang, Jueming Bing, Tik Lun Leung, Anh Dinh Bui, Hongjun Chen, Jianpeng Yi, Stephen P. Bremner, Hieu T. Nguyen, & Anita W. Y. HoBaillie. (2023). ACS Energy Letters(8). https://doi.org/10.1021/acsenergylett.2c02164
IEEE [1] Md Arafat Mahmud, Jianghui Zheng, Shi Tang, Chwenhaw Liao, Guoliang Wang, Jueming Bing, Tik Lun Leung, Anh Dinh Bui, Hongjun Chen, Jianpeng Yi, Stephen P. Bremner, Hieu T. Nguyen, and Anita W. Y. HoBaillie, ACS Energy Letters, no. 8, 2023, doi: 10.1021/acsenergylett.2c02164.