Journal
NATURE ENERGY
Volume 3, Issue 10, Pages 847-854Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41560-018-0219-8
Keywords
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Funding
- Welsh European Funding Office (Ser Cymru II Program)
- Australian Research Council
- Australian Research Council [FL160100067]
- Chinese Scholarship Council studentship
- Australian Government through the Australian Renewable Energy Agency (ARENA) Australian Centre for Advanced Photovoltaics
- German Federal Ministry of Education and Research (BMBF), within the project 'Materialforschung fur die Energiewende' [03SF0540]
- German Federal Ministry for Economic Affairs and Energy (BMWi) [0324037C]
- joint University Potsdam-HZB graduate school 'hypercells'
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The performance of perovskite solar cells is predominantly limited by non-radiative recombination, either through trap-assisted recombination in the absorber layer or via minority carrier recombination at the perovskite/transport layer interfaces. Here, we use transient and absolute photoluminescence imaging to visualize all non-radiative recombination pathways in planar pintype perovskite solar cells with undoped organic charge transport layers. We find significant quasi-Fermi-level splitting losses (135 meV) in the perovskite bulk, whereas interfacial recombination results in an additional free energy loss of 80 meV at each individual interface, which limits the open-circuit voltage (V-oc) of the complete cell to similar to 1.12 V. Inserting ultrathin interlayers between the perovskite and transport layers leads to a substantial reduction of these interfacial losses at both the p and n contacts. Using this knowledge and approach, we demonstrate reproducible dopant-free 1 cm(2) perovskite solar cells surpassing 20% efficiency (19.83% certified) with stabilized power output, a high V-oc (1.17 V) and record fill factor (>81%).
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