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Title: Long-range balanced electron- and hole-transport lengths in organic-inorganic CH3NH3PbI3
Authors: Xing, Guichuan
Mathews, Nripan
Sun, Shuangyong
Lim, Swee Sien
Lam, Yeng Ming
Grätzel, Michael
Mhaisalkar, Subodh Gautam
Sum, Tze Chien
Keywords: DRNTU::Engineering::Materials
Issue Date: 2013
Source: Xing, G., Mathews, N., Sun, S., Lim, S. S., Lam, Y. M., Grätzel, M., Mhaisalkar, S., & Sum, T. C. (2013). Long-range balanced electron- and hole-transport lengths in organic-inorganic CH3NH3PbI3. Science, 342(6156), 344-347.
Series/Report no.: Science
Abstract: Low-temperature solution-processed photovoltaics suffer from low efficiencies because of poor exciton or electron-hole diffusion lengths (typically about 10 nanometers). Recent reports of highly efficient CH3NH3PbI3-based solar cells in a broad range of configurations raise a compelling case for understanding the fundamental photophysical mechanisms in these materials. By applying femtosecond transient optical spectroscopy to bilayers that interface this perovskite with either selective-electron or selective-hole extraction materials, we have uncovered concrete evidence of balanced long-range electron-hole diffusion lengths of at least 100 nanometers in solution-processed CH3NH3PbI3. The high photoconversion efficiencies of these systems stem from the comparable optical absorption length and charge-carrier diffusion lengths, transcending the traditional constraints of solution-processed semiconductors.
ISSN: 1095-9203
DOI: 10.1126/science.1243167
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2013 American Association for the Advancement of Science. This is the author created version of a work that has been peer reviewed and accepted for publication by Science, American Association for the Advancement of Science. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at DOI: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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