Analysis of interface carrier accumulation and relaxation in pentacene/C60 double-layer organic solar cell by impedance spectroscopy and electric-field-induced optical second harmonic generation

2011 ◽  
Vol 110 (7) ◽  
pp. 074509 ◽  
Author(s):  
Xiangyu Chen ◽  
Dai Taguchi ◽  
Tatsunori Shino ◽  
Takaaki Manaka ◽  
Mitsumasa Iwamoto
Keyword(s):  
Solar Cell ◽  
Impedance Spectroscopy ◽  
Electric Field ◽  
Second Harmonic Generation ◽  
Double Layer ◽  
Harmonic Generation ◽  
Organic Solar Cell ◽  
Second Harmonic ◽  
Optical Second Harmonic Generation

Study of Electrical Conduction Mechanism of Organic Double-Layer Diode Using Electric Field Induced Optical Second Harmonic Generation Measurement

2016 ◽  
Vol 16 (4) ◽  
pp. 3364-3367
Author(s):  
Shohei Nishi ◽  
Dai Taguchi ◽  
Takaaki Manaka ◽  
Mitsumasa Iwamoto
Keyword(s):  
Electric Field ◽  
Second Harmonic Generation ◽  
Double Layer ◽  
Harmonic Generation ◽  
Transport Mechanism ◽  
Carrier Transport ◽  
Second Harmonic ◽  
Transport Layer ◽  
Pmma Layer ◽  
Optical Second Harmonic Generation

By using electric field induced optical second harmonic generation (EFISHG) and current voltage (I–V) measurements, we studied the electrical transport mechanism of organic doublelayer diodes with a structure of Au/N, N′-di-[(1-naphthyl)-N, N′-diphenyl]-(1,1′-biphenyl)-4,4′-diamine (α-NPD)/poly(methyl methacrylate) (PMMA)/indium zinc oxide (IZO). Here the α-NPD is a carrier transport layer and the PMMA is an electrical insulating layer. The current level was very low, but the I–V characteristics showed a rectifying behavior. The EFISHG measurement selectively and directly probed the electric field across the α-NPD layer, and showed that the electric field across the α-NPD layer is completely relaxed owing to the charge accumulation at the α-NPD/PMMA interface in the region V>0, whereas the carrier accumulation was not significant in the region V<0. On the basis of these experimental results, we proposed a model of the rectification. Further, by coupling the I–V characteristics with the EFISHG measurement, the I–V characteristics of the diodes were well converted into the current-electric field (I–E) characteristics of the α-NPD layer and the PMMA layer. The I–E characteristics suggested the Schottky-type conduction governs the carrier transport. We conclude that the I–V measurement coupled with the EFISHG measurement is very useful to study carrier transport mechanism of the organic double-layer diodes.

Sign in / Sign up

Export Citation Format

Share Document