Efficiency enhancement of inverted organic solar cells by introducing PFDTBT quantum dots into PCDTBT:PC71BM active layer

• Polymer quantum dots are got by a facile approach and doped into active layer as a bifunctional additive.
• The short-circuit current and fill factor are both enhanced, leading to an 23.8% increase in power conversion efficiency.
• PFDTBT QDs can enhance the utilization of UV light and improve charge carrier transport properties of OSCs.

Poly{[2,7-(9-(20-ethylhexyl)-9-hexyl-fluorene])-alt-[5,50-(40,70-di-2-thienyl-20,10,30-benzothid-iazole)]} (PFDTBT) quantum dots (QDs) is synthesized by a facile approach and doped into organic solar cells (OSCs). The dependence of device performance on PFDTBT QDs in the blend film is investigated. The results show that short-circuit current density (Jsc) is apparently enhanced while corresponding open-circuit voltage maintained, leading to an increase in power conversion efficiency (PCE). Maximum PCE of 6.81% is obtained, corresponding to a 23.8% enhancement compared with the undoped device. PFDTBT QDs can act as two kinds of role for improvement of OSCs’ performance: one is improving the utilization ratio of ultraviolet light; the other is effectively improving charge transport property.

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