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For CdS/CdTe solar cells with conventional Cu doped CdTe at the back contact, the diffusion of copper into CdS window layer is detrimental to the solar cell performance. In order to obviate this problem, single wall carbon nanotube thin films with enriched semiconducting ratio (95% S-SWNT) are applied to the CdS/CdTe device and their suitability as back contact materials are studied. We achieve solar...
In this work, we have investigated the performance of solar cells based on heterojunctions formed by Si and single-walled carbon nanotubes (SWNTs). Our findings indicate that SWNTs show the outstanding performance on transferring infrared light into electrical energy. In addition, the encapsulation of C60 fullerene inside SWNTs is found to significantly enhance the performance of solar cells through...
Here, we demonstrate incorporation of carbon nanotubes (CNTs) in the active layer of donor-acceptor based solar cells and thereby significantly enhanced device performance. In this work, bulk heterojunction solar cells were fabricated with P3HT and PCBM incorporating chemically modified CNTs. Enhanced device performance was achieved for P3HT:PCBM solar cells incorporating a certain amount of modified...
Investigation on the thickness dependent analysis clearly demonstrates that the slow carrier mobility is the main reason limiting the power conversion efficiency of conjugated polymer/fullerene organic solar cells. In order to increase the carrier mobility, single-walled carbon nanotubes (SWCNTs) are introduced into organic solar cells made from blended films of regioregular poly 3-hexylthiophene...
Two-junction tandem thin-film photovoltaic cells are composed of a wide-bandgap top cell overlying a narrower-bandgap bottom cell. CdTe, with a bandgap of 1.5 eV, can function effectively as a top cell when paired with a bottom cell of appropriate bandgap. Effective two-junction cells require a back contact to the top cell that is transparent to the sub-bandgap radiation absorbed by the bottom cell...
An enhancement in the performance of P3HT:SWNT bulk heterojunction solar cell was achieved by using a buffer layer of P3HT between the anode and the bulk layer. The buffer layer improved the shunt resistance of the device (1 wt% SWNT) from 25 k?? to 400 k??. This resulted in the increase of open circuit voltage from 0.06 V to 0.45 V. Because of the increased thickness, the light absorbed by the device...
Here we report fabrication of organic solar cells incorporating of functionalized carbon nanotubes (CNTs). Poly (3-octylthiophene)/C60 heterojunction solar cells were fabricated with and without incorporation of functionalized MWNTs. Fabricated device with incorporation of MWNTs shows enhanced device performance than that of device without MWNTs. This is due to fact that, MWNTs provide large surface...
By introducing single-walled carbon nanotubes (SWNTs) into bulk heterojunction (BHJ) organic solar cells made from blended films of regioregular poly (3-hexylthiophene) (P3HT) and methanofullerene (PCBM), the short circuit current of these devices has been increased up to 14% compared with the device without SWNTs. It is surmised that the increased short circuit current in P3HT:PCBM:SWNT devices is...
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