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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Layered mixed tin-lead hybrid perovskite solar cells with high stability Daniel Ramirez , Kelly Schutt , Zhiping Wang , Andrew J. Pearson , Edoardo Ruggeri , Henry J. Snaith , Samuel D. Stranks , Franklin Jaramillo Acs Energy Letters DOI: 10.1021/acsenergylett.8b01411 Diamond Proposal Number(s): [17223] Show Abstract ▼ Abstract: Tin-lead mixed metal hybrid perovskites with tunable band gaps are attractive candidates to be used as the low-band gap cell in high efficiency tandem solar cells. Nevertheless, perovskites containing tin have a greater propensity to degrade due to the fast oxidation of Sn2+ to Sn4+, which is a restrictive factor in the development of these materials. Although significant improvements are achieved with Pb:Sn mixed-metal perovskites, in comparison to neat Sn perovskites, the intrinsic instability may still pose a threat to long-term operation. For neat Pb perovskites, two dimensional (2D) hybrid perovskites, where n layers of inorganic material are separated by a long chain organic cation, generally exhibit greater stability but have lower photovoltaic performance characteristics, motivating the study of 2D/3D mixed dimension systems to realize both high efficiency and stability. In this report we demonstrate such optimal compromise between performance and stability using formamidinium, cesium and t-butylammonium as A-site cations with Pb:Sn mixed metal low band gap perovskites. As determined by film structure measurements, the optimised 2D perovskite phases facilitate improved luminescence efficiency, which we infer to be via surface defect site passivation. Perovskite solar cells based on n = 4 and n = 5 lead-tin perovskites achieved power conversion efficiencies of up to 9.3% and 10.6%, respectively and correspondingly retained 47% and 29% of their initial efficiency during storage in nitrogen for 2000 hours. A similar stability trend for n = 4 over n = 5 was also observed for unencapsulated devices during continuous operation under combined air atmosphere and temperature for 10 hours, resulting in improved stability over the 3D lead-tin counterpart.	Aug 2018

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I07-Surface & interface diffraction

Layered mixed tin-lead hybrid perovskite solar cells with high stability

Daniel Ramirez , Kelly Schutt , Zhiping Wang , Andrew J. Pearson , Edoardo Ruggeri , Henry J. Snaith , Samuel D. Stranks , Franklin Jaramillo

Acs Energy Letters

DOI: 10.1021/acsenergylett.8b01411

Diamond Proposal Number(s): [17223]

Show Abstract ▼

Aug 2018