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Title: | Compositional engineering of tin-lead halide perovskites for efficient and stable low band gap solar cells | Authors: | Prasanna, Rohit Leijtens, Tomas Gold-Parker, Aryeh CONINGS, Bert BABAYIGIT, Aslihan BOYEN, Hans-Gerd Toney, Michael F. McGehee, Michael D. |
Issue Date: | 2018 | Publisher: | IEEE | Source: | 2018 IEEE 7TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION (WCPEC) (A JOINT CONFERENCE OF 45TH IEEE PVSC, 28TH PVSEC & 34TH EU PVSEC), IEEE,p. 1718-1720 | Series/Report: | World Conference on Photovoltaic Energy Conversion WCPEC | Abstract: | Tin-lead halide perovskites show promise as low-band gap absorbers to enable efficient all-perovskite tandem solar cells. While they have reached high efficiencies in single junction and in tandem solar cells, tin-containing perovskites face unique challenges - such as a tendency to degrade by oxidation of tin and sometimes very short carrier lifetimes that limit diffusion lengths. We map oxidation stability and important optoelectronic properties - band gap, carrier lifetime, and solar cell performance - across a wide range of compositions varying the A-site cation and the tin: lead ratio at the B-site. We identify mechanisms by which composition tunes the band gap in ways distinct from what has been reported for pure lead-based perovskites. We show that alloying tin with lead changes the mechanism by which tin is oxidized to a pathway that is relatively unfavourable. This significantly stabilizes the perovskite toward oxidation. Using a low band gap perovskite absorber, we demonstrate a 17.8% efficient single junction solar cell. Further, by employing a sputtered ITO top electrode, we demonstrate continuous operation of a solar cell in air with only a small drop in efficiency that is reversible upon storage in the dark. This work creates a set of guiding principles to intelligently choose the best compositions for making efficient and stable solar cells based on tin-containing low band gap perovskites. | Notes: | [Prasanna, Rohit; Leijtens, Tomas; McGehee, Michael D.] Stanford Univ, Mat Sci & Engn, Stanford, CA 94305 USA. [Gold-Parker, Aryeh; Toney, Michael F.] Stanford Synchrotron Radiat Lightsource, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA. [Conings, Bert; Babayigit, Aslihan; Boyen, Hans-Gerd] Hasselt Univ, Inst Mat Res, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. | Keywords: | Photonic band gap; Tin; Photovoltaic cells; Oxidation; Lead; Charge carrier lifetime | Document URI: | http://hdl.handle.net/1942/28770 | ISBN: | 9781538685297 | DOI: | 10.1109/PVSC.2018.8547344 | ISI #: | 000469200401161 | Rights: | 2018 IEEE | Category: | C1 | Type: | Proceedings Paper | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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