Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 41, Issue -, Pages 43-51Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.04.019
Keywords
Perovskite solar cell; Crystallization; Formic acid; Additive
Funding
- National Key Research and Development Program of China [2016YFA0202403/2017YFA0204800]
- National Natural Science Foundation of China [61604091, 61674098, B14041]
- National University Research Fund [GK261001009, GK201603107]
- Changjiang Scholar and Innovative Research Team [IRT_14R33]
- 111 Project [B14041]
- Chinese National 1000-talent-plan program [1110010341]
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Improving the quality of the perovskite active layer is crucial to obtaining high performance perovskite solar cells (PSCs). In this work, by introducing formic acid into the formamidinium lead iodide (FAPbI(3)) precursor solution, we managed to achieve reduced colloidal size in the solution, leading to more uniform deposition of FAPbI(3) film with lower trap state density and higher carrier mobility. The solar cells based on the FAPbI(3) absorber layer modified with formic acid show significantly better photovoltaic performance than that on the reference FAPbI(3) film without formic acid. The device performance shows a close correlation with the colloidal size. Within the range studied from 6.7 to 1.0 nm, the smaller the colloidal size is, the higher the solar cell efficiency. More specifically, the cell efficiency is improved from 17.82% for the control cell without formic acid to 19.81% when 0.764 M formic acid was used. Formic acid has also been added into a CH3NH3PbI3 (MAPbI(3)) precursor solution, which exhibits a similar effect on the resulting MAPbI(3) films and solar cells, with efficiency improved from 16.07% to 17.00%. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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