Organic bulk heterojunction solar cells were fabricated under identical experimental conditions, except by varying the solvent polarity used for spin coating the active layer components and their performance was evaluated systematically. Results showed that presence of nitrobenzene-chlorobenzene composition governs the morphology of active layer formed, which is due to the tuning of solvent polarity as well as the resulting solubility of the P3HT:PCBM blend. Trace amount of nitrobenzene favoured the formation of better organised P3HT domains, as evident from conductive AFM, tapping mode AFM and surface, and cross-sectional SEM analysis. The higher interfacial surface area thus generated produced cells with high efficiency. But, an increase in the nitrobenzene composition leads to a decrease in cell performance, which is due to the formation of an active layer with larger size polymer domain networks with poor charge separation possibility.
Lead Selenide (PbSe) quantum dots (QDs) with absorption in the NIR region are synthesized in a noncoordinating solvent, octadecene by organometallic synthesis procedure. The high resolution transmission electron microscopy (HRTEM) analysis demonstrated spherical shape and monodispered nature of PbSe Quantum dots. Absorption spectrum demonstrates that the QDs show absorbance in the near infrared (NIR) region. The synthesized QDs give a good dispersion in n-hexane.
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