Singh, Ashish2019-10-042023-10-262019-10-042023-10-262017ROLL NO.126153004https://gyan.iitg.ac.in/handle/123456789/1371Supervisor: Parameswar K IyerThe demand of cost efficient organic bulk heterojunction (BHJ) solar cells and different device architecture modulation methods are of prime importance for improving the power conversion efficiency (PCE) values. This thesis mainly focuses to modify the cathode and anode buffer layers to improve the PCE of very commonly studied organic BHJ system, namely, regioregular poly(3-hexylthiophene-2,5-diyl) (rrP3HT):[6,6]-Phenyl C61/71 butyric acid methyl ester (PC61/71BM). For modulating cathode contact, different types of hole and electron rich small molecules were introduced in the device structure, whereas, to modulate the anode contact various types of easily synthesized plasmon induced metal (Gold and Silver) nanoparticles were doped in the hole injecting PEDOT:PSS layer. The thesis mainly introduced a very simple, unique and robust methodology consisting of the combined effect of dual cathode buffer layers and different shaped plasmon induced metal nanoparticles for improving the PCE value as well as the morphological information of very commonly studied rrP3HT:PCBM system which can be further used in the next generation of solar cell technology.enPlasmonic Bulk Heterojunction Solar CellsP3HT:PCBMCathode Buffer Layers, Metal NanoparticlesThesis