Enhancing the Efficiency of organic hybrid solar cell by cooperating polysilic acid nanodots into hole transport layer PEDOT:PSS
Date Issued
2010
Date
2010
Author(s)
Lin, Jhih-Fong
Abstract
Due to the good transparency and conductivity of Poly(3,4ethylenedioxythiophene) -polystyrenesulfonic acid (PEDOT:PSS), it commonly used as carrier transport material in organic photovoltaic devices. In this work, morphology change and phase separation of different doped PEDOT:PSS film are studied by AFM to explore the influence of different additive in PEDOT:PSS hole transport layer. Otherwise, we also used different methods like space charge limited current and four point probe method to detect electric properties of corresponding doped PEDOT:PSS films. The additive, Polymeric nanodot (PND) solution is composed of solvent tetrahydrofuran (THF) and polysilic acid. The space limited charge current fitting curves revealed that hole-blocking effect was attributed from the solvent THF instead of polysilic acid, however the polysilic acid doped in PEDOT:PSS polymer complex could help the hole transport by inducing charge screening between PEDOT:PSS. We also applied these doped PEDOT:PSS layer into two different polymer solar cell : P3HT/TiO2 and P3HT/PCBM hybrid solar cell, the doping of PND-OH and PND-NH2 can enhance the power conversion efficiency of P3HT/TiO2, but in P3HT/PCBM solar cell system, PND-NH2 and PND-OH doped samples exhibited different characteristic. The reason for efficiency enhancement and reduction of different PND doping ratio in PEDOT:PSS layer was interesting, we thought the balance of electron and hole mobility in P3HT/PCBM system is better than P3HT/TiO2 system. The addition of particles of negative or positive surface potential would induce hole-blocking effect and charge screening effect between PEDOT and PSS. As the result, the performance of doped sample would change by the competition of above two effects decided by different ligand capped on PND and corresponding doping ratio in PEDOT:PSS.
Subjects
PEDOT:PSS
PND
THF
P3HT/TiO2 and P3HT/PCBM.
SDGs
Type
thesis
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