Wang, Y;
Wu, J;
Zhang, P;
Liu, D;
Zhang, T;
Ji, L;
Gu, X;
... Li, S; + view all
(2017)
Stitching triple cation perovskite by a mixed anti-solvent process for high performance perovskite solar cells.
Nano Energy
, 39
pp. 616-625.
10.1016/j.nanoen.2017.07.046.
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Abstract
With the rapid development of organic-inorganic lead halide perovskite photovoltaics, increasingly more attentions are paid to explore the growth mechanism and precisely control the quality of perovskite films. In this study, we propose a “stitching effect” to fabricate high quality perovskite films by using chlorobenzene (CB) as an anti-solvent and isopropyl alcohol (IPA) as an additive into this anti-solvent. Because of the existence of IPA, CB can be efficiently released from the gaps of perovskite precursors and the perovskite film formation can be slightly modified in a controlled manner. More homogeneous surface morphology and larger grain size of perovskite films were achieved via this process. The reduced grain boundaries ensure low surface defect density and good carrier transport in the perovskite layer. Meanwhile, we also performed the Fourier transform infrared (FTIR) spectroscopy to investigate the film growth mechanism of unannealed and annealed perovskite films. Solar cells fabricated by using the “stitching effect” exhibited a best efficiency of 19.2%. Our results show that solvent and solvent additives dramatically influenced the formation and crystallization processes for perovskite materials due to their different coordination and extraction capabilities. This method presents a new path towards controlling the growth and morphology of perovskite films.
| Type: | Article |
|---|---|
| Title: | Stitching triple cation perovskite by a mixed anti-solvent process for high performance perovskite solar cells |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.nanoen.2017.07.046 |
| Publisher version: | http://doi.org/10.1016/j.nanoen.2017.07.046 |
| 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: | Perovskite solar cells, Morphology engeering, Mixed solvent, Stitching effect, Triple cation, Anti-solvent |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1576223 |
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