09:30 〜 11:30
▲ [10a-PB1-4] Air-processed ternary active layers for neutral color transparent polymer solar cells
キーワード：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.