Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703057
Keywords
charge carrier mobility; charge recombination; inorganic cations; perovskite solar cells; trap density
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Funding
- Federal Ministry of Education and Research (BMBF) [03SF0516B, 03SF0514A/B]
- Bavarian Collaborative Research Program Solar Technologies Go Hybrid (SolTech)
- Center for NanoScience (CeNS)
- German Research Foundation (DFG) Excellence Cluster Nanosystems Initiative Munich (NIM)
- Netherlands Organisation for Scientific Research (NWO)
- Bavarian Ministry of Economic Affairs and Media, Energy and Technology
- DFG [GRK 2112, 382633022]
- Scientific and Technological Research Council of Turkey
- Fonds der chemischen Industrie
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Adding cesium (Cs) and rubidium (Rb) cations to FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3) hybrid lead halide perovskites results in a remarkable improvement in solar cell performance, but the origin of the enhancement has not been fully understood yet. In this work, time-of-flight, time-resolved microwave conductivity, and thermally stimulated current measurements are performed to elucidate the impact of the inorganic cation additives on the trap landscape and charge transport properties within perovskite solar cells. These complementary techniques allow for the assessment of both local features within the perovskite crystals and macroscopic properties of films and full devices. Strikingly, Csincorporation is shown to reduce the trap density and charge recombination rates in the perovskite layer. This is consistent with the significant improvements in the open-circuit voltage and fill factor of Cs-containing devices. By comparison, Rb-addition results in an increased charge carrier mobility, which is accompanied by a minor increase in device efficiency and reduced currentvoltage hysteresis. By mixing Cs and Rb in quadruple cation (Cs-Rb-FA-MA) perovskites, the advantages of both inorganic cations can be combined. This study provides valuable insights into the role of these additives in multiplecation perovskite solar cells, which are essential for the design of high-performance devices.
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