journal article·2020-07-10Open access

Large Conduction Band Energy Offset Is Critical for High Fill Factors in Inorganic Perovskite Solar Cells

Qiong Wang, Fengshuo Zu, Pietro Caprioglio, Christian M. Wolff, Martin Stolterfoht, Meng Li, Silver-Hamill Turren-Cruz, Norbert Koch, Dieter Neher, Antonio Abate

ACS Energy Letters· Volume 5· Issue 7

Abstract

Although SnO2 has been reported to give high efficiencies of over 20% for organic–inorganic perovskite solar cells and has been frequently used in perovskite tandem solar cells, very few contributions have explored its feasibility in inorganic perovskite solar cells (IPSCs). Inorganic perovskites with a wide bandgap tunable from 1.7 to 2.0 eV are promising candidates for top cells in tandem structures; development of IPSCs based on SnO2 will greatly benefit their integration into tandem solar cells. We examined SnO2 in comparison to the prevalent TiO2. We found that although SnO2 had a good energy alignment with the inorganic perovskite and exhibited slower nonradiative recombination, the relatively low conduction band minimum energy offset restricted efficient charge extraction. In contrast, TiO2 that had a large energy offset of ∼400 meV led to a high fill factor of 78.7% and a state-of-the-art efficiency of 14.2% for IPSCs with a bandgap of 1.93 eV.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Young Investigator Group Active Materials and Interfaces for Stable Perovskite Solar Cells, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, Germany

Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany

Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany

Young Investigator Group Perovskite Tandem Solar Cells, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kekuléstraße 5, 12489 Berlin, Germany

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kekuléstraße 5, 12489 Berlin, Germany

Department of Chemical, Materials and Production Engineering, University of Naples Federioco II, Piazzale Tecchio 80, 80125 Fuorigrotta, Naples, Italy

State Key Laboratory of Photocatalysis on Energy and Environment, Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian 350002, China

Funding

Universit?t Potsdam · Deutsche Forschungsgemeinschaft · Helmholtz-Zentrum Berlin

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