Abstract
The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1-xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.
| Original language | English |
|---|---|
| Pages (from-to) | 22604-22614 |
| Number of pages | 11 |
| Journal | Journal of Materials Chemistry A |
| Volume | 7 |
| Issue number | 39 |
| Early online date | 20 Sep 2019 |
| DOIs | |
| Publication status | Published - 21 Oct 2019 |
ASJC Scopus subject areas
- Chemistry(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
Influence of bromide content on iodide migration in inverted MAPb(I1-: XBrx)3 perovskite solar cells. / García-Rodríguez, Rodrigo; Ferdani, Dominic; Pering, Samuel; Baker, Peter J.; Cameron, Petra J.
In: Journal of Materials Chemistry A, Vol. 7, No. 39, 21.10.2019, p. 22604-22614.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Influence of bromide content on iodide migration in inverted MAPb(I1-: XBrx)3 perovskite solar cells
AU - García-Rodríguez, Rodrigo
AU - Ferdani, Dominic
AU - Pering, Samuel
AU - Baker, Peter J.
AU - Cameron, Petra J.
PY - 2019/10/21
Y1 - 2019/10/21
N2 - The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1-xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.
AB - The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1-xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.
UR - http://www.scopus.com/inward/record.url?scp=85073505621&partnerID=8YFLogxK
U2 - 10.1039/c9ta08848b
DO - 10.1039/c9ta08848b
M3 - Article
AN - SCOPUS:85073505621
VL - 7
SP - 22604
EP - 22614
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 39
ER -