Journal
NANOSCALE RESEARCH LETTERS
Volume 7, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1186/1556-276X-7-353
Keywords
(CH3CH2NH3)PbI3; 2H perovskite; Dye-sensitized solar cell; Nanodot; Sensitizer
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) of Korea [2011-0016441, 2011-0030359, R31-2008-10029]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy [20103020010010]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20103020010010] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0014992] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new nanocrystalline sensitizer with the chemical formula (CH3CH2NH3)PbI3 is synthesized by reacting ethylammonium iodide with lead iodide, and its crystal structure and photovoltaic property are investigated. X-ray diffraction analysis confirms orthorhombic crystal phase with a = 8.7419(2) , b = 8.14745(10) , and c = 30.3096(6) , which can be described as 2 H perovskite structure. Ultraviolet photoelectron spectroscopy and UV-visible spectroscopy determine the valence band position at 5.6 eV versus vacuum and the optical bandgap of ca. 2.2 eV. A spin coating of the CH3CH2NH3I and PbI2 mixed solution on a TiO2 film yields ca. 1.8-nm-diameter (CH3CH2NH3)PbI3 dots on the TiO2 surface. The (CH3CH2NH3)PbI3-sensitized solar cell with iodide-based redox electrolyte demonstrates the conversion efficiency of 2.4% under AM 1.5 G one sun (100 mW/cm(2)) illumination.
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