Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 4, Pages 1406-1414Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta10418e
Keywords
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Funding
- National High-tech R&D Program of China (863 Program) [2015AA034601]
- National Natural Science Foundation of China [91333122, 61204064, 51202067, 51372082, 51402106, 11504107]
- Par-Eu Scholars Program
- Fundamental Research Funds for the Central Universities
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) of Korea [NRF-2012M3A6A7054861]
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The structure of the perovskite solar cells (PSCs) is either mesoporous or planar. Here, a novel structure for highly efficient and stable PSCs is proposed, i.e., an embedded structure, which combines the advantages of the mesoporous and planar structures. The embedded structure utilizes a TiO2 nanoparticle embedded perovskite (CH3NH3PbI3) film as the absorption layer. The presence of TiO2 nanoparticles in the perovskite film could improve the electron extraction, and promote the formation of a compact perovskite layer with large grains. Consequently, the performance of the PSCs is significantly improved with the efficiency increasing from 16.6% for the planar structure to 19.2% for the embedded structure, which is the best performance of the MAPbI(3)-based PSCs. Furthermore, the TiO2 embedded perovskite films present better long-term stability than the pristine perovskite films, and the corresponding PSCs, which have no other chemical modifications, also show excellent stability with efficiency approaching 80% (for average) or 90% (for the best) after being exposed to air for 28 days without encapsulation.
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