Efficient and stable wide bandgap perovskite solar cells through surface passivation with long alkyl chain organic cations

The Duong; Huyen Pham; Yanting Yin; Jun Peng; Md Arafat Mahmud; YiLiang Wu; Heping Shen; Jianghui Zheng; Thanh Tran-Phu; Teng Lu; Li Li; Anand Kumar; Gunther G. Andersson; Anita Ho-Baillie; Yun Liu; Thomas White; Klaus Weber; Kylie Catchpole

doi:10.1039/D1TA05699A

Efficient and stable wide bandgap perovskite solar cells through surface passivation with long alkyl chain organic cations†

The Duong,

*^a Huyen Pham,^b Yanting Yin,^cd Jun Peng,^a Md Arafat Mahmud,‡^a YiLiang Wu,

^a Heping Shen,

^a Jianghui Zheng,

^ef Thanh Tran-Phu,^g Teng Lu,

^h Li Li,ⁱ Anand Kumar,^cd Gunther G. Andersson,

^cd Anita Ho-Baillie,

^ef Yun Liu,

^h Thomas White,

^a Klaus Weber

^a and Kylie Catchpole*^a

Author affiliations

* Corresponding authors

^a School of Engineering, The Australian National University, Canberra 2601, Australia
E-mail: the.duong@anu.edu.au, kylie.catchpole@anu.edu.au

^b Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra 2601, Australia

^c Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, SA 5042, Australia

^d Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia

^e The University of Sydney Nano Institute (Sydney Nano), School of Physics, University of Sydney, Sydney 2006, Australia

^f Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia

^g Nanotechnology Research Laboratory, School of Engineering, The Australian National University, Canberra 2601, Australia

^h Research School of Chemistry, The Australian National University, Canberra 2601, Australia

ⁱ Australian National Fabrication Facility (ANFF), Department of Electronic Materials Engineering, The Australian National University, Canberra 2601, Australia

Abstract

Defects on perovskite surfaces acting as charge-carrier-traps are a key factor limiting the performance of perovskite solar cells (PSCs). Here we studied the defect passivation effect of three bromide-containing alkylammonium organic cations with increasing alkyl-chain-length: n-butylammonium bromide, n-octylammonium bromide and n-dodecylammonium bromide on a perovskite composition with 1.72 eV bandgap. Long-alkyl-chain organic cations were found to have a greater passivation effect compared to their shorter counterparts due to greater reduction in surface defects and substantial changes in the electronic structure of the passivated perovskite films. The efficiency of 1.72 eV PSCs was improved to 19.1% with an excellent open-circuit-voltage of over 1280 mV. The long-alkyl-chain passivation significantly improved the moisture and light stability of PSCs as the unencapsulated devices retained >90% of the initial performance after 144 h at 70–85% relative-humidity and >93% of the initial performance after operating under light for 80 h. The study has paved the way for efficient and stable wide bandgap perovskite top cells used in perovskite-silicon tandem solar cells.

Journal of Materials Chemistry A

Efficient and stable wide bandgap perovskite solar cells through surface passivation with long alkyl chain organic cations†

Abstract

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Efficient and stable wide bandgap perovskite solar cells through surface passivation with long alkyl chain organic cations

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