Study of electron blocking layer in polymer solar cells
Date Issued
2009
Date
2009
Author(s)
Chen, Po-Yu
Abstract
In recent years, organic photovoltaic (OPV) cells offer several advantages over the more traditional inorganic photovoltaic cells, including fabrication with flexible substrates, light-weight, production by low-cost techniques such as spin-coating and printing, large area and low temperature. Thus, the BHJ structure has emerged as an attractive OPV architecture because the phase-separated active layer promotes efficient separation of photogenerated excitons into charge carriers. But there is always a problem in BHJ cells that both the donor polymer and the acceptor molecule are touching both electrodes. This means that electrons in the PCBM may be formed at an interface very close to the ITO anode, which typically collects the holes. Any electrons transferred to the ITO would essentially recombine with holes and reduce the working voltage and the power conversion of the device. A similar effect should take place at the cathode if the device was reversed.We use an electron blocking layer between the active layer and the anode to prevent the leakage current. Result show that the prevention of leakage current leads to the greater performance of shunt resistance and open circuit voltage. The EBL is beneficial to the prevention of leakage current, resulting in higher performance of the photovoltaic cell.
Subjects
electron blocking layer
bulk heterojunction structure
polymer solar cells
SDGs
Type
thesis
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