期刊
SOLAR RRL
卷 3, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201900199
关键词
energy conversion; perovskite solar cells; photovoltaics; stability; 2D perovskite
资金
- FAPESP [2017/11986-5]
- CNPq
- CAPES
- INEO
- Brazilian Nanotechnology National Laboratory LNNano
- Sao Paulo Research Foundation (FAPESP) [2017/12582-5, 2013/16245-2]
- Shell
- ANP (Brazil's National Oil, Natural Gas and Biofuels Agency) through the RAMP
- D levy regulation
Hybrid organic and inorganic perovskite solar cells lack long-term stability, and this negatively impacts the widespread application of this emerging and promising photovoltaic technology. Herein, aiming to increase the stability of perovskite films based on CH3NH3PbI3 and to deeply understand the formation of 2D structures, solutions of alkylammonium chlorides containing 8, 10, and 12 carbons are introduced during the spin-coating on the surface of 3D perovskite films leading to the in situ formation of 2D structures. It is possible to identify the chemical formulae of some 2D structures formed by X-ray diffraction and UV-vis analysis of the modified films. Interestingly, the increase in the stability of the CH3NH3PbI3 films due to the formation of a 2D + 3D perovskite network is only possible in planar TiO2 substrates. The increase in stability of the CH3NH3PbI3 films follows the surfactant molecule order: octylammonium (8C) > decylammonium (1 degrees C) > dodecylammonium (12C) chlorides > standard. An increase of 17.6% in the lifetime of the devices assembled with octylammonium-modified perovskite film is observed compared with that of the standard device, which is directly linked to the improvement of the charge carrier lifetimes obtained from time-correlated single photon counting measurements.
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