Publication date: 1st July 2014
A recent study of organic-inorganic hybrid perovskite as light harvesters and hole transport materials has revolutionized the emerging photovoltaic technology. In the past three years, the performance of perovskite solar cells has improved rapidly to reach efficiencies as high as 16%. So far, perovskite solar cells have mainly focused on 2,2’,7,7’-tetrakis(N,N-di-p-methoxyphenylamine)-9,9’-spirobifluorene (spiro-MeOTAD) as HTM. However, spiro-MeOTAD suffers from low conductivity and hole mobility. The widespread application in organic electronic devices has an important strategy to alter the charge-transport properties of organic semiconductor using chemical doped. To overcome these problems additional charge carrier are generated by doping, a common technique to tune the electrical properties. Herein we report on the use of a novel class of metal complexes as p-type dopants for spiro-MeOTAD and their application in Perovskite solar cells. Moreover, we discuss the influence of doping level on photovoltaic performance using the electrochemical impedance spectroscopy and achieve the high efficiency with spiro-MeOTAD-based Perovskite solar cells.
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