High Performance Bulk-Heterojunction Organic Solar Cells

Extracting high power conversion efficiency (PCE) from Bulk heterojunction (BHJ) organic solar cells is one of the striking candidate for photovoltaic (PV) research community, as low efficiency restrict the commercialization of OSCs. In this paper, we have investigated two high performance bulk heterojuznction organic structures based on P3HT: PCBM and PTB7: PCBM under illumination of 100 mW/Cm
²
-AM (Air Mass) 1.5G. The extracted performance parameters indicates that the structure (S
₂
) based on PTB7: PCBM holds the highest power conversion efficiency of 6.47% with shot current density, Jsc= 9.78 mA/m
²
, open circuit voltage, V
_oc
=0.898 V and fill factor, FF=73.65% when collate with the investigated P3HT: PCBM based structure (S
₁
), which holds a power conversion efficiency of 4.52% with J
_sc
=7.92 mA/m
²
, V
_oc
=0.791V and FF=72.31%. The investigation of optical absorption for both the structures has been performed and founded that structure (S
₂
) based on PTB7: PCBM shows an excellent absorption of photons in the visible spectrum of light when analogized with P3HT: PCBM based structure (S
₁
). The effect on the photovoltaic electrical parameters due to rise in temperature is also presented and observed that the high temperature has negative impact on the photovoltaic performance parameters when temperature of the device varied from 300-400K and drops in ηoccur from 4.52% to 3.98% for (S
₁
) and 6.47% to 5.85% for (S
₂
).