Journal
ACS NANO
Volume 10, Issue 6, Pages 5999-6007Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b01535
Keywords
photovoltaic; perovskite; heterojunction; solar cell; layered compound; moisture stability
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Funding
- German Federal Ministry of Education and Research (BMBF) [01162525/1]
- Bavarian Collaborative Research Program Solar Technologies Go Hybrid (SolTech)
- Center for NanoScience (CeNS)
- DFG Excellence Cluster Nanosystems Initiative Munich (NIM)
- European Union through the award of a Marie Curie Intra-European Fellowship
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Recently developed organic inorganic hybrid perovskite solar cells combine low-cost fabrication and high power conversion efficiency. Advances in perovskite film optimization have led to an outstanding power conversion efficiency of more than 20%. Looking forward, shifting the focus toward new device architectures holds great potential to induce the next leap in device performance. Here, we demonstrate a perovskite/perovskite heterojunction solar cell. We developed a facile solution based cation infiltration process to deposit layered perovskite (LPK) structures onto methylammonium lead iodide (MAPI) films. Grazing-incidence wide-angle X-ray scattering experiments were performed to gain insights into the crystallite orientation and the formation process of the perovskite bilayer. Our results show that the self-assembly of the LPK layer on top of an intact MAPI layer is accompanied by a reorganization of the perovskite interface. This leads to an enhancement of the open-circuit voltage and power conversion efficiency due to reduced recombination losses, as well as improved moisture stability in the resulting photovoltaic devices.
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