9:30 AM - 11:30 AM
▲ [10a-PB1-4] Air-processed ternary active layers for neutral color transparent polymer solar cells
Keywords:Polymer Solar Cells, Ternary Active Layers, Photovoltaic Window
Polymer solar cell (PSC) active layers based on three active materials can harvest a large amount of sunlight resulting in high short-circuit current densities (Jsc) and power conversion efficiencies (PCEs) over 14%. If the three components have complementary absorption properties, active layers uniformly absorbing visible light are formed which can be employed for semi-transparent photovoltaic windows fabrication. We combined an air-stable electron donor (PCDTBT) with reference fullerene (PC71BM) and non-fullerene (ITIC) acceptors in inverted architecture PSCs and compared the photovoltaic performances and operational stability of binary (PCDTBT:PC71BM) and ternary (PCDTBT:PC71BM:ITIC) devices.
We observed that PSCs with a PCDTBT:PC71BM:ITIC composition of 1:4:1 yield similar PCEs to binary (1:4:0) ones in both opaque and semi-transparent devices. The slightly higher Jsc in 1:4:1 PSCs compensates for the small decrease observed in fill factor (FF) upon addition of ITIC to the binary blend. Although uniformly absorbing active layers are produced with a 1:3:1 ratio, lower photovoltaic performances were measured (Fig. 1). When combined with semi-transparent MoO3 (10 nm)/Ag (15 nm)/MoO3 (30 nm) top anodes, the 1:4:1 active layers produce neutral color semi-transparent PSCs with an average PCE over 4% and better operational stability than binary and opaque devices.
We observed that PSCs with a PCDTBT:PC71BM:ITIC composition of 1:4:1 yield similar PCEs to binary (1:4:0) ones in both opaque and semi-transparent devices. The slightly higher Jsc in 1:4:1 PSCs compensates for the small decrease observed in fill factor (FF) upon addition of ITIC to the binary blend. Although uniformly absorbing active layers are produced with a 1:3:1 ratio, lower photovoltaic performances were measured (Fig. 1). When combined with semi-transparent MoO3 (10 nm)/Ag (15 nm)/MoO3 (30 nm) top anodes, the 1:4:1 active layers produce neutral color semi-transparent PSCs with an average PCE over 4% and better operational stability than binary and opaque devices.