Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 44, Pages 17659-17669Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b07381
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Funding
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation [200021_160112, 200020_178860]
- HOMING program of the Foundation for Polish Science - European Union under the European Regional Development Fund [POIR04.04.00-00-5EE7/18-00]
- Swiss National Science Foundation via the NCCR MUST
- Sinergia grant EPISODE
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Chemical doping of inorganic organic hybrid perovskites is an effective way of improving the performance and operational stability of perovskite solar cells (PSCs). Here we use 5-ammonium valeric acid iodide (AVAI) to chemically stabilize the structure of alpha-FAPbI(3). Using solid-state MAS NMR, we demonstrate the atomic-level interaction between the molecular modulator and the perovskite lattice and propose a structural model of the stabilized three-dimensional structure, further aided by density functional theory (DFT) calculations. We find that one-step deposition of the perovskite in the presence of AVAI produces highly crystalline films with large, micrometer-sized grains and enhanced charge-carrier lifetimes, as probed by transient absorption spectroscopy. As a result, we achieve greatly enhanced solar cell performance for the optimized AVA-based devices with a maximum power conversion efficiency (PCE) of 18.94%. The devices retain 90% of the initial efficiency after 300 h under continuous white light illumination and maximum-power point-tracking measurement.
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