Water-free, conductive hole transport layer for reproducible perovskite-perovskite tandems with record fill factor

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. Ho-Baillie

doi:10.1021/acsenergylett.2c02164

Water-free, conductive hole transport layer for reproducible perovskite-perovskite tandems with record fill factor

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. Ho-Baillie^*

^*Corresponding author for this work

School of Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	21-30
Number of pages	10
Journal	ACS Energy Letters
Volume	8
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.2c02164
Publication status	Published - 13 Jan 2023

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title = "Water-free, conductive hole transport layer for reproducible perovskite-perovskite tandems with record fill factor",

abstract = "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.",

author = "Mahmud, {Md Arafat} and Jianghui Zheng and Shi Tang and Chwenhaw Liao and Guoliang Wang and Jueming Bing and Leung, {Tik Lun} and Bui, {Anh Dinh} and Hongjun Chen and Jianpeng Yi and Bremner, {Stephen P.} and Nguyen, {Hieu T.} and Ho-Baillie, {Anita W. Y.}",

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doi = "10.1021/acsenergylett.2c02164",

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AU - Mahmud, Md Arafat

AU - Zheng, Jianghui

AU - Tang, Shi

AU - Liao, Chwenhaw

AU - Wang, Guoliang

AU - Bing, Jueming

AU - Leung, Tik Lun

AU - Bui, Anh Dinh

AU - Chen, Hongjun

AU - Yi, Jianpeng

AU - Bremner, Stephen P.

AU - Nguyen, Hieu T.

AU - Ho-Baillie, Anita W. Y.

PY - 2023/1/13

Y1 - 2023/1/13

N2 - 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.

AB - 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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Water-free, conductive hole transport layer for reproducible perovskite-perovskite tandems with record fill factor

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