Highly stable and efficient all-inorganic lead-free perovskite solar cells with native-oxide passivation.

Autor: Chen M; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA., Ju MG; Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA., Garces HF; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA., Carl AD; Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, MA, 01609, USA., Ono LK; Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan., Hawash Z; Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan., Zhang Y; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA., Shen T; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA., Qi Y; Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan., Grimm RL; Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, MA, 01609, USA., Pacifici D; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA., Zeng XC; Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA., Zhou Y; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA. yuanyuan_zhou@brown.edu., Padture NP; School of Engineering, Brown University, Providence, Rhode Island, 02912, USA. nitin_padture@brown.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2019 Jan 03; Vol. 10 (1), pp. 16. Date of Electronic Publication: 2019 Jan 03.
DOI: 10.1038/s41467-018-07951-y
Abstrakt: There has been an urgent need to eliminate toxic lead from the prevailing halide perovskite solar cells (PSCs), but the current lead-free PSCs are still plagued with the critical issues of low efficiency and poor stability. This is primarily due to their inadequate photovoltaic properties and chemical stability. Herein we demonstrate the use of the lead-free, all-inorganic cesium tin-germanium triiodide (CsSn 0.5 Ge 0.5 I 3 ) solid-solution perovskite as the light absorber in PSCs, delivering promising efficiency of up to 7.11%. More importantly, these PSCs show very high stability, with less than 10% decay in efficiency after 500 h of continuous operation in N 2  atmosphere under one-sun illumination. The key to this striking performance of these PSCs is the formation of a full-coverage, stable native-oxide layer, which fully encapsulates and passivates the perovskite surfaces. The native-oxide passivation approach reported here represents an alternate avenue for boosting the efficiency and stability of lead-free PSCs.
Databáze: MEDLINE