Huang, Zhangfeng;
Du, Zhuowei;
Ma, Zhu;
Zheng, Yujie;
Zhang, Qian;
You, Wei;
Yang, Junbo;
... Ding, Liming; + view all
(2024)
Lead iodide secondary growth and π-π stack regulation for sequential perovskite solar cells with 23.62% efficiency.
Chemical Engineering Journal
, 499
, Article 156684. 10.1016/j.cej.2024.156684.
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CEJ-D-24-27416_R1-19-71, Accepted version.pdf - Accepted Version Access restricted to UCL open access staff until 18 October 2025. Download (5MB) |
Abstract
The sequential deposited perovskite solar cells (PSCs) have received widespread attention due to its application potential in large-scale perovskite module and perovskite/silicon tandem solar cells. However, insufficient reaction between organic ammonium salts and PbI2 leads to residual PbI2 and low crystallinity of perovskite films, and the fragile Pb-I bonds easily creates iodine loss and reduces the stability of PbI6 framework. In this work, the 4-fluorobenzylamine (FBA) with C = O and –NH2 is employed in PbI2 precursor solution to regulate the secondary growth process of PbI2 film. Due to the low Gibbs free energy and high crystallinity of porous PbI2 film, sufficient reaction between organic ammonium salts and PbI2 is promoted, which results in large-grain, low-defect perovskite films. At the same time, through hydrogen bonding and π-π stacking interactions, the stability of the PbI6 skeleton is effectively improved, significantly suppressing non-radiative recombination and reducing defect state density. Finally, this strategy increases the power conversion efficiency (PCE) of PSCs from 22.06 % to 23.62 %, and the target PSCs maintain 96 % of their initial PCE after being placed in nitrogen for 1300 h.
| Type: | Article |
|---|---|
| Title: | Lead iodide secondary growth and π-π stack regulation for sequential perovskite solar cells with 23.62% efficiency |
| DOI: | 10.1016/j.cej.2024.156684 |
| Publisher version: | http://dx.doi.org/10.1016/j.cej.2024.156684 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Sequential perovskite solar cells; Secondary growth; PbI2 regulation; π-π stack; PbI6 framework |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10200519 |
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