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- Title
Growth of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> cuboids with controlled size for high-efficiency perovskite solar cells.
- Authors
Im, Jeong-Hyeok; Jang, In-Hyuk; Park, Nam-Gyu; Pellet, Norman; Grätzel, Michael
- Abstract
Perovskite solar cells with submicrometre-thick CH3NH3PbI3 or CH3NH3PbI3-xClx active layers show a power conversion efficiency as high as 15%. However, compared to the best-performing device, the average efficiency was as low as 12%, with a large standard deviation (s.d.). Here, we report perovskite solar cells with an average efficiency exceeding 16% and best efficiency of 17%. This was enabled by the growth of CH3NH3PbI3 cuboids with a controlled size via a two-step spin-coating procedure. Spin-coating of a solution of CH3NH3I with different concentrations follows the spin-coating of PbI2, and the cuboid size of CH3NH3PbI3 is found to strongly depend on the concentration of CH3NH3I. Light-harvesting efficiency and charge-carrier extraction are significantly affected by the cuboid size. Under simulated one-sun illumination, average efficiencies of 16.4% (s.d. ± 0.35), 16.3% (s.d. ± 0.44) and 13.5% (s.d. ± 0.34) are obtained from solutions of CH3NH3I with concentrations of 0.038 M, 0.050 M and 0.063 M, respectively. By controlling the size of the cuboids of CH3NH3PbI3 during their growth, we achieved the best efficiency of 17.01% with a photocurrent density of 21.64 mA cm-2, open-circuit photovoltage of 1.056 V and fill factor of 0.741.
- Subjects
PEROVSKITE; ELECTRIC properties; ENERGY conversion; LIGHT-harvesting complex (Photosynthesis); ENERGY consumption; PHOTOVOLTAIC effect
- Publication
Nature Nanotechnology, 2014, Vol 9, Issue 11, p927
- ISSN
1748-3387
- Publication type
Article
- DOI
10.1038/nnano.2014.181