Abstract:
Bulk heterojunction (BHJ) based organic solar cells (OSCs) are gaining greater
attention for clean energy production due to various features, namely low-cost, easy
fabrication process, the feasibility of solution process, mechanical flexibility, nontoxicity,
and biodegradability. Recently, the low bandgap polymer, poly[N-9′-heptadecanyl-
2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT)
has been considered to be more suitable p-type donor polymer for the OSC. The
PCDTBT is blended with the commonly used acceptor polymer PC61BM for the
fabrication of OSC and provides better stability as well as improved photovoltaic
parameters. Considering the above aspects, the present thesis is focused to fabricate and
characterize the PCDTBT:PC61BM active layer based BHJ OSC by modifying the
interface layer, transport layers, and the photoactive layer. The works of the thesis are
intended to enhance the photovoltaic parameters through thin film engineering. The
thesis consists of five chapters which are briefly outlined in the following sentences.
