HOPV12 - Blogs

4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 170
C52 - PEO modified ZnO enhances the performance of hybrid solar cells
Shuyan Shao, Fengling Zhang
Linköping university, IFM, Linköping university, , Linköping, SE
ZnO nanoparticles (NPs) modified with poly(ethylene oxide) (PEO) were used as either
electron acceptors in the active layer or an buffer layer between ITO and active layers in
inverted hybrid solar cells (HSCs).
It is observed that all photovoltaic parameters (short-circuit current density (Jsc), opencircuit
voltage (Voc) and fill factor (FF)) of inverted HSCs are increased, which result in an
overall efficiency increased from 3% to 4.7% by adding PEO modified ZnO buffer layer between
active layer and ITO via thermal annealing.
In addition, the performance of normal HSCs composed of a polymer and ZnO nanoparticles
as electron acceptors is also improved by modifying ZnO nano-particles with PEO. The
enhanced PCE from 0.75% to 1% due to increase Jsc from 1.9 mA/cm 2 to 2.4 mA/cm 2 and FF
from 0.47 to 0.50. Mobility measurement indicates that the enhanced Jsc and FF is attributed to
transportation property improvement by ZnO nano-particles modified with PEO.
To understand the mechanism of improvement in devices with thermal annealing or/and
modified with PEO, the morphology, optical and electrical properties of the active layers were
investigated with Atomic Force Microscopy (AFM), Absorption, Charge Extraction with Linearly
Increasing Voltage (CELIV), Ultraviolet Photoelectron Spectroscopy (UPS), Photoluminescence,
Electroluminescence and Dynamic Light Scattering (DLS).
© SEFIN 2012