Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 15, Pages 2662-2669Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz501373f
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Funding
- Israel Strategic Alternative Energy Foundation (I-SAEF)
- Israeli Ministry of Science Technology
- CNR-EFOR
- FP7-ENERGY project ES-CORT [261920]
- Rieger-JNF Fellowship
- European Union [316494]
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Photoconductivity measurements of CH3NH3PbI3 deposited between two dielectric-protected Au electrodes show extremely slow response. The CH3NH3PbI3, bridging a gap of similar to 2000 nm, was subjected to a DC bias and cycles of 5 min illumination and varying dark duration. The approach to steady -state photocurrent lasted tens of seconds with a strong dependence on the dark duration preceding the illumination. On the basis of DFT calculations, we propose that under light + bias the methylammonium ions are freed to rotate and align along the electric field, thus modifying the structure of the inorganic scaffold. While ions alignment is expected to be fast, the adjustment of the inorganic scaffold seems to last seconds as reflected in the extremely slow photoconductivity response. We propose that under working conditions a modified, photostable, perovskite structure is formed, depending on the bias and illumination parameters. Our findings seem to clarify the origin of the well-known hysteresis in perovskite solar cells.
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