scholarly journals Effect of Internal Electric Fields on Charge Carrier Dynamics in a Ferroelectric Material for Solar Energy Conversion

2016 ◽  
Vol 28 (33) ◽  
pp. 7123-7128 ◽  
Author(s):  
Madeleine R. Morris ◽  
Stephanie R. Pendlebury ◽  
Jongin Hong ◽  
Steve Dunn ◽  
James R. Durrant
Keyword(s):  
Solar Energy ◽  
Charge Carrier ◽  
Energy Conversion ◽  
Electric Fields ◽  
Solar Energy Conversion ◽  
Ferroelectric Material ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics

Ultrafast charge carrier dynamics in CH3NH3PbI3: evidence for hot hole injection into spiro-OMeTAD

2016 ◽  
Vol 4 (25) ◽  
pp. 5922-5931 ◽  
Author(s):  
Jan C. Brauer ◽  
Yong Hui Lee ◽  
Mohammad Khaja Nazeeruddin ◽  
Natalie Banerji
Keyword(s):  
Solar Energy ◽  
Charge Carrier ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Carrier Dynamics ◽  
Excess Energy ◽  
Hole Injection ◽  
Charge Carrier Dynamics

Hybrid organic–inorganic metal perovskites have emerged as highly promising materials for solar energy conversion. In this study the influence of excess energy on the initial photo-products in CH3NH3PbI3, as well as the hole injection into spiro-OMeTAD have been investigated.

Spatial distribution of active sites on a ferroelectric PbTiO3 photocatalyst for photocatalytic hydrogen production

2017 ◽  
Vol 198 ◽  
pp. 463-472 ◽  
Author(s):  
Rengui Li ◽  
Yue Zhao ◽  
Can Li
Keyword(s):  
Spatial Distribution ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Electric Fields ◽  
Charge Separation ◽  
Active Sites ◽  
Solar Energy Conversion ◽  
Photogenerated Electrons ◽  
The Right

The separation of photogenerated charge carries is a challenging issue in artificial photocatalyst systems for solar energy conversion. It has been reported that spatial charge separation can take place between different facets of semiconductor-based crystals with regular morphology and facets, which could be used to rationally deposit cocatalysts on the right facets. However, the spatial separation of photogenerated electrons and holes is still a big challenge for a particulate photocatalyst without regular morphology and specific facets. In this work, we demonstrated that photogenerated electrons and holes can be regularly separated on ferroelectric PbTiO3 photocatalyst even without regular morphology and facets. The reduction cocatalyst and oxidation cocatalyst could be selectively formed on different sites via an in situ photochemical deposition method. It is found that the photoactivity and hydrogen production for PbTiO3 with spatially separated dual-cocatalysts is remarkably enhanced to more than 100 times greater compared to native PbTiO3, which is much higher than that the case of dual-cocatalysts with a random distribution. The intrinsic electric fields and spontaneous electric polarization in the bulk of PbTiO3 are proposed to play important roles in the spatial distribution of active sites on irregular PbTiO3 particles. Our work emphasizes the essential roles of two important factors, efficient charge separation strategy and the location of dual-cocatalysts on the right sites, to construct integrated artificial photocatalyst systems for solar energy conversion.

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