Abstract

In this paper, we report the photovoltaic response of the solution processed DBPYM: PCBM bulk heterojunction (BHJ) solar cell. The BHJ showed power conversion efficiency (PCE) up to 2.11 %. The PCE has been further improved up to 2.93 % after thermal annealing of the DBPYM: PCBM layer. The increase in the PCE with the thermally annealed blend is mainly attributed to the improvement in incident photon to current efficiency (IPCE) and short circuit photocurrent (Jsc). Thermal annealing leads to an increase in both the crystallinity of the blend and hole mobility, which improves the PCE.

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