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Understanding the Impact of Carbon Nanotubes in Environmental Protection
Published in Soney C. George, Jacob Philip, Ann Rose Abraham, A. K. Haghi, Carbon Nanotubes for Energy and Environmental Applications, 2023
The active nanoscale surface area of CNTs also allows for massive absorption of photons for solar energy harvesting, but due to the presence of a delocalized electron system it enhances the mobility of charge transfer.65 Good alignment between CNTs will improve their photoconductivity after lighting.35 Silicon-based solar cells use the simplest pn junction to detach electrons/holes and generate electricity after illumination. When embedded in silicone, CNTs serve as a heterojunction for charging separation, as a highly conductive percolated network for charging, and as a transparent electrode for light illumination and charging. Some heterojunctions observed modest cell efficiency with improved stability.29 The creation of organic solar cells has drawn a great deal of interest from researchers as a consequence of being flexible and having low production costs compared with silicone-based solar cells. For light absorption and charge transfer, organic solar cells rely on conductive organic polymers, such as poly(3-octylthiophene)(P3OT), poly(3-hexylthiophene)(P3HT), or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM).28 New work indicates an increase in performance with the introduction of CNTs into the top electrode of the photoactive layer and the back electrode of the organic solar cells. CNTs function as photoactive material in the photoactive layer and improve cell efficiency by providing efficient transport of the hole or electron to the CNT/polymer interface.59,78 The photoactive part designed with P3OT/ CNT exhibited a higher open-circuit voltage using the high capacity of the CNTs for the transport of electrons. CNTs manage to have a wide surface area in the top and back of the electron for high optical transmittance and low sheet resistance to reduce power loss.
New small organic molecules based on thieno[2,3-b]indole for efficient bulk heterojunction organic solar cells: a computational study
Published in Molecular Physics, 2020
Mohamed Hachi, Ahmed Slimi, Asmae Fitri, Souad ElKhattabi, Adil Touimi Benjelloun, Mohammed Benzakour, Mohammed Mcharfi
The most promising organic photovoltaic solar cells using small molecules are based on bulk heterojunction (BHJ) structures containing π-conjugated compound as donor and phenyl-C61 butyric acid methyl ester (PCBM) as electron acceptor [51–53]. This three-dimensional fullerene (PCBM) has a significant photovoltaic conversion as an acceptor material [54,55]. To adjust the electronic properties of the studied compounds, HOMO and LUMO energy levels and PCBM should be compared. In addition, the LUMO energy of the acceptor (PCBM) must be lower than that obtained of donor and the HOMO energy of donor must be higher to that of PCBM, making the hole and electron transfer between donor and PCBM available. Through the Table 5, we can observe that all of the molecules seem suitable to be used as donor in the bulk heterojunction (BHJ) solar cell.