Fundamental Carrier Lifetime Exceeding 1 µs in Cs<inf>2</inf>AgBiBr<inf>6</inf> Double Perovskite
Authors
Wei, F
Brivio, F
Sun, S
Li, W
Zhang, KHL
MacManus-Driscoll, JL
Cheetham, AK
Publication Date
2018-08-09Journal Title
Advanced Materials Interfaces
ISSN
2196-7350
Publisher
Wiley-Blackwell
Volume
5
Issue
15
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Hoye, R., Eyre, L., Wei, F., Brivio, F., Sadhanala, A., Sun, S., Li, W., et al. (2018). Fundamental Carrier Lifetime Exceeding 1 µs in Cs<inf>2</inf>AgBiBr<inf>6</inf> Double Perovskite. Advanced Materials Interfaces, 5 (15)https://doi.org/10.1002/admi.201800464
Abstract
There is current interest in finding non-toxic alternatives to lead-halide perovskites for optoelectronic applications. Silver-bismuth double perovskites have recently gained attention, but evaluating their carrier lifetime and recombination mechanisms from photoluminescence measurements is challenging due to their indirect bandgap. In this work, we use transient absorption spectroscopy to directly track the photocarrier population in Cs2AgBiBr6 by measuring the ground state bleach dynamics. We resolve a small initial drop in the ground state bleach on a picosecond timescale, after which the remaining photocarriers decay mono-exponentially with a lifetime of 1.4 μs. The majority of the early-time decay is attributed to hot-carrier thermalization from the direct transition to the indirect bandgap, and the 1.4 μs lifetime represents the recombination of most photocarriers. From this lifetime, we calculate a steady-state excess carrier density of 2.2 × 10^16 cm-3 under 1 sun, which is an order of magnitude larger than that for methylammonium lead iodide, suggesting that charge transport and extraction can be efficient in Cs2AgBiBr6 solar cells.
Sponsorship
EPSRC (EP/L015978/1, EP/L000202/1, EP/M005143/1, EP/L0011700/1)
Magdalene College, Cambridge
Indo-UK APEX Project
UKIERI
Isaac Newton Trust (Minute 13.38(k))
Herchel Smith Trust
Winton Programme for the Physics of Sustainability
Funder references
EPSRC (EP/M005143/1)
EPSRC (via Brunel University London) (unknown)
EPSRC (EP/L015978/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1002/admi.201800464
This record's URL: https://www.repository.cam.ac.uk/handle/1810/276131
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