| Autor: |
Arora, N, Dar, MI, Abdi-Jalebi, M, Giordano, F, Pellet, N, Jacopin, G, Friend, RH, Zakeeruddin, SM, Grätzel, M |
| Jazyk: |
angličtina |
| Předmět: |
|
| Popis: |
We report on both the intrinsic and the extrinsic stability of a formamidinium lead bromide [CH(NH$_{2}$)$_{2}$PbBr$_{3}$ = FAPbBr$_{3}$] perovskite solar cell that yields a high photovoltage. The fabrication of FAPbBr$_{3}$ devices, displaying an outstanding photovoltage of 1.53 V and a power conversion efficiency of over 8%, was realized by modifying the mesoporous TiO2-FAPbBr$_{3}$ interface using lithium treatment. Reasons for improved photovoltaic performance were revealed by a combination of techniques, including photothermal deflection absorption spectroscopy (PDS), transient-photovoltage and charge-extraction analysis, and time-integrated and time-resolved photoluminescence. With lithium-treated TiO$_{2}$ films, PDS reveals that the TiO2-FAPbBr$_{3}$ interface exhibits low energetic disorder, and the emission dynamics showed that electron injection from the conduction band of FAPbBr$_{3}$ into that of mesoporous TiO$_{2}$ is faster than for the untreated scaffold. Moreover, compared to the device with pristine TiO$_{2}$, the charge carrier recombination rate within a device based on lithium-treated TiO$_{2}$ film is 1 order of magnitude lower. Importantly, the operational stability of perovskites solar cells examined at a maximum power point revealed that the FAPbBr$_{3}$ material is intrinsically (under nitrogen) as well as extrinsically (in ambient conditions) stable, as the unsealed devices retained over 95% of the initial efficiency under continuous full sun illumination for 150 h in nitrogen and dry air and 80% in 60% relative humidity (T = ∼60 °C). The demonstration of high photovoltage, a record for FAPbBr$_{3}$, together with robust stability renders our work of practical significance. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
