Abstract
Negative capacitance in photovoltaic devices has been observed and reported in several cases, but its origin, at low or intermediate frequencies, is under debate. Here we unambiguously demonstrate a direct correlation between the observation of this capacitance and a corresponding decrease in performance of a halide perovskite (HaP; CsPbBr3)-based device, expressed as reduction of open-circuit voltage and fill factor. We have prepared highly stable CsPbBr3 HaPs that do not exhibit any degradation over the duration of the impedance spectroscopy measurements, ruling out degradation as the origin of the observed phenomena. Reconstruction of current-voltage curves from the impedance spectroscopy provided further evidence of the deleterious role of negative capacitance on photoconversion performance.
| Original language | English |
|---|---|
| Pages (from-to) | 2007-2013 |
| Number of pages | 7 |
| Journal | ACS Energy Letters |
| Volume | 2 |
| Issue number | 9 |
| DOIs | |
| State | Published - 8 Sep 2017 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 American Chemical Society.
Funding
The work was supported by MINECO of Spain (project MAT2016-76892-C3-1-R) by Generalitat Valenciana (Project PROMETEOII/2014/020) and by University Jaume I (Project UJIB2016-35). For work at the Weizmann Institute, partial support from the Israel Ministry of Science’s Tashtiot program is gratefully acknowledged. D.C. holds the Sylvia and Rowland Schaefer Chair in Energy Research. I.M.-S. acknowledges Weizmann Institute for supporting him with a fellowship at the Institute.
| Funders | Funder number |
|---|---|
| MINECO of Spain | MAT2016-76892-C3-1-R |
| Ministry of Science’s | |
| University Jaume I | UJIB2016-35 |
| Weizmann Institute of Science | |
| Generalitat Valenciana | PROMETEOII/2014/020 |
| Ministry of science and technology, Israel |
