Characterization of Interfacial Modifiers for Hybrid Solar Cells | Zendy

Jonas Weickert | Zendy; Florian Auras | Zendy; Thomas Bein | Zendy; Lukas SchmidtMende | Zendy

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Characterization of Interfacial Modifiers for Hybrid Solar Cells

Author(s) -

Jonas Weickert,

Florian Auras,

Thomas Bein,

Lukas SchmidtMende

Publication year - 2011

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp203600z

Subject(s) - photocurrent , materials science , quenching (fluorescence) , charge carrier , nanometre , optoelectronics , coating , characterization (materials science) , absorption (acoustics) , planar , photoluminescence , photovoltaic system , polymer , hybrid solar cell , polymer solar cell , chemical engineering , chemical physics , solar cell , nanotechnology , chemistry , optics , composite material , physics , ecology , computer graphics (images) , engineering , computer science , fluorescence , biology

This study systematically investigates the influence of different TiO2 surface modifiersonthedevicepropertiesofTiO2 poly(3-hexylthiophene)(P3HT)hybridsolarcellsto inferdesignrulesfor interfaces inhybrid solar cells.BareTiO2iscomparedtoTiO2modifiedwith a Ru(II) dye (Z907), phenyl-C61-butyric acid (PCBA), the carboxylated polymer poly(3-(5- carboxypentyl)thiophene-2,5-diyl) (P3HT-COOH), and Sb2S3, respectively. Self-assembled monolayers are investigated for the former three modifiers, whereas a thin coating of only a few nanometers is used in the case of Sb2S3. Photoluminescence quenching analysis is performed for the different TiO2 P3HT interfaces to gain insight into the mechanism of charge separation. For further analysis, the different modifiers are tested in solar cells. We focus on bilayered devices with a well-defined near-planar TiO2 P3HT interface for easier data analysis. Absorption of light by the modifiers can thus be neglected. In addition, detailed current densityvoltage curve analysis, photovoltage, and photocurrent decay measurements reveal mechanisms of charge carrier recombination and extraction. Our study underlines the importance of recombination control and matching energy levels as well as proper alignment of P3HT at the interface.

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