Microscopic Inhomogeneity and Ultrafast Orientational Motion in an Organic Photovoltaic Bulk Heterojunction Thin Film Studied with 2D IR Vibrational Spectroscopy

2006 ◽  
Vol 110 (48) ◽  
pp. 24281-24286 ◽  
Author(s):  
Larry W. Barbour ◽  
Maureen Hegadorn ◽  
John B. Asbury
Keyword(s):  
Thin Film ◽  
Vibrational Spectroscopy ◽  
Bulk Heterojunction ◽  
Organic Photovoltaic ◽  
2D Ir ◽  
Microscopic Inhomogeneity ◽  
Orientational Motion

scholarly journals Influence of Thermal Annealing on the Electrical Properties of Poly(3-hexylthiophene)-Based Thin Film Diodes

2007 ◽  
Vol 62 (10-11) ◽  
pp. 609-619 ◽  
Author(s):  
Zivayi Chiguvare ◽  
Jürgen Parisi ◽  
Vladimir Dyakonov
Keyword(s):  
Thin Film ◽  
Thermal Annealing ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Polymer Chains ◽  
Hole Injection ◽  
Before And After ◽  
Output Characteristics ◽  
Al Thin Film ◽  
Poly Styrene Sulfonate

The effects of thermal annealing on the bulk transport properties of poly(3-hexylthiophene) (P3HT) were studied by analyzing room temperature current-voltage characteristics of polymer thin films sandwiched between indium tin oxide/poly[ethylene dioxythiophene]:poly[styrene sulfonate] (ITO/PEDOT:PSS) and aluminum electrodes, before and after a thermal annealing step. It was observed that annealing takes place in two steps: (1) Dedoping of the polymer of impurities such as oxygen, remnant solvent, water, leading to a decrease in the conductivity of the film, and (2) thermally induced motion of the polymer chains leading to closer packing, thus, stronger inter-chain interaction and, consequently, increase in conductivity. It was also observed that the ITO/PEDOT:PSS/P3HT hole injection barrier increases on annealing the ITO/PEDOT:PSS/P3HT/Al thin film devices. The implications of impurity dedoping and closer packing on the output characteristics of bulk heterojunction polymer-fullerene thin film solar cells are discussed.

Sign in / Sign up

Export Citation Format

Share Document