Article

Efficient luminescent solar cells based on tailored mixed-cation perovskites

Dongqin BiLaboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandWolfgang TressLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandM. Ibrahim DarGroup for Molecular Engineering of Functional Materials, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandPeng GaoGroup for Molecular Engineering of Functional Materials, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandJingshan LuoLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandClémentine RenevierLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandKurt SchenkInstitute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandAntonio AbateLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandFabrizio GiordanoLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandJuan‐Pablo Correa‐BaenaLaboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandJean‐David DecoppetLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandShaik M. ZakeeruddinLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandMohammad Khaja NazeeruddinGroup for Molecular Engineering of Functional Materials, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandMichaël GrätzelLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, SwitzerlandAnders HagfeldtLaboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland

2016en

ABI

Abstract

We report on a new metal halide perovskite photovoltaic cell that exhibits both very high solar-to-electric power-conversion efficiency and intense electroluminescence. We produce the perovskite films in a single step from a solution containing a mixture of FAI, PbI2, MABr, and PbBr2 (where FA stands for formamidinium cations and MA stands for methylammonium cations). Using mesoporous TiO2 and Spiro-OMeTAD as electron- and hole-specific contacts, respectively, we fabricate perovskite solar cells that achieve a maximum power-conversion efficiency of 20.8% for a PbI2/FAI molar ratio of 1.05 in the precursor solution. Rietveld analysis of x-ray diffraction data reveals that the excess PbI2 content incorporated into such a film is about 3 weight percent. Time-resolved photoluminescence decay measurements show that the small excess of PbI2 suppresses nonradiative charge carrier recombination. This in turn augments the external electroluminescence quantum efficiency to values of about 0.5%, a record for perovskite photovoltaics approaching that of the best silicon solar cells. Correspondingly, the open-circuit photovoltage reaches 1.18 V under AM 1.5 sunlight.

Identifiers

DOI: 10.1126/sciadv.1501170

Citations and references

Cited by 20 references

Metrics — AkademScholar