Perera, W Hashini K;
Webb, Thomas;
Xu, Yuliang;
Zhu, Jingwei;
Zhou, Yundong;
Trindade, Gustavo F;
Masteghin, Mateus G;
... Silva, S Ravi P; + view all
(2025)
23.2% efficient low band gap perovskite solar cells with cyanogen management.
Energy & Environmental Science
, 18
(1)
pp. 439-453.
10.1039/d4ee03001j.
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Abstract
Managing iodine formation is crucial for realising efficient and stable perovskite photovoltaics. Poly(3,4-ethylenedioxythiophene)polystyrene sulfonate (PEDOT:PSS) is a widely adopted hole transport material, particularly for perovskite solar cells (PSCs). However, improving the performance and stability of PEDOT:PSS based perovskite optoelectronics remains a key challenge. We show that amine-containing organic cations de-dope PEDOT:PSS, causing performance loss, which is partially recovered with thiocyanate additives. However, this comes at the expense of device stability due to cyanogen formation from thiocyanate-iodine interaction which is accelerated in the presence of moisture. To mitigate this degradation pathway, we incorporate an iodine reductant in lead-tin PSCs. The resulting devices show an improved power conversion efficiency of 23.2% which is among the highest reported for lead-tin PSCs, and ∼66% enhancement in the TS80 lifetime under maximum power point tracking and ambient conditions. These findings offer insights for designing next-generation hole extraction materials for more efficient and stable PSCs.
| Type: | Article |
|---|---|
| Title: | 23.2% efficient low band gap perovskite solar cells with cyanogen management |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d4ee03001j |
| Publisher version: | https://doi.org/10.1039/d4ee03001j |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
| Keywords: | Science & Technology, Physical Sciences, Technology, Life Sciences & Biomedicine, Chemistry, Multidisciplinary, Energy & Fuels, Engineering, Chemical, Environmental Sciences, Chemistry, Engineering, Environmental Sciences & Ecology, PEDOT, PSS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10203299 |
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