Details

Autor(en) / Beteiligte

• Xing, Guichuan
• Mathews, Nripan
• Sun, Shuangyong
• Lim, Swee Sien
• Lam, Yeng Ming
• Grätzel, Michael
• Mhaisalkar, Subodh
• Sum, Tze Chien

Titel

Long-range balanced electron- and hole-transport lengths in organic-inorganic CH3NH3PbI3

Ist Teil von

• Science (American Association for the Advancement of Science), 2013-10, Vol.342 (6156), p.344-347

Ort / Verlag

United States: The American Association for the Advancement of Science

Erscheinungsjahr

2013

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.