Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells
- Title
- Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells
- Author
- 강용수
- Keywords
- HIGH-PERFORMANCE; LOW-COST; TEMPERATURE; MOBILITIES; DEPOSITION; TITANATE; ORIGIN
- Issue Date
- 2014-06
- Publisher
- AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 권: 5 호: 13, 페이지: 2390-2394
- Abstract
- Organic-inorganic lead trihalide perovskites have emerged as an outstanding photovoltaic material that demonstrated a high 17.9% conversion efficiency of sunlight to electricity in a short time. We have found a giant dielectric constant (GDC) phenomenon in these materials consisting on a low frequency dielectric constant in the dark of the order of epsilon(0) = 1000. We also found an unprecedented behavior in which epsilon(0) further increases under illumination or by charge injection at applied bias. We observe that Eo increases nearly linearly with the illumination intensity up to an additional factor 1000 under 1 sun. Measurement of a variety of samples of different morphologies, compositions, and different types of contacts shows that the GDC is an intrinsic property of MAPbX(3) (MA = CH3NH3+). We hypothesize that the large dielectric response is induced by structural fluctuations. Photoinduced carriers modify the local unit cell equilibrium and change the polarizability, assisted by the freedom of rotation of MA. The study opens a way for the understanding of a key aspect of the photovoltaic operation of high efficiency perovskite solar cells.
- URI
- http://pubs.acs.org/doi/10.1021/jz5011169
- ISSN
- 1948-7185
- DOI
- 10.1021/jz5011169
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML