Journal
NATURE NANOTECHNOLOGY
Volume 9, Issue 11, Pages 927-932Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2014.181
Keywords
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) of Korea [NRF-2010-0014992, NRF-2012M1A2A2671721, NRF-2012M3A7B4049986, NRF-2012M3A6A7054861]
- European Research Council (ERC) under the 'Mesolight' project [ARG 247404]
- National Research Foundation of Korea [2012M3A6A7054861, 2010-0014992, 2012M3A7B4049986, 2009-0092951] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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