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Enhancement of photovoltaic performance in immiscible ternary blends
摘要： Ternary-blend active layers composed of one donor and two acceptors have been actively studied to enhance the power conversion efficiency (PCE) of organic solar cells (OSCs), and numerous advances in miscible ternary blends have been reported. In the present study, we report an unusual behavior of immiscible ternary blends with respect to the enhancement of PCE and stability of OSC devices. The active layer consists of three relatively easily synthesizable materials: poly[(4,8-bis(5-(2-ethylhexyl)thiophen2-yl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-((5-bromo-4-octylthiazol-2-yl)thiophene-2,5-diyl)] (POTz) as a donor, 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) as a nonfullerene acceptor, and [6,6]-phenyl-C70-butyric acid methyl ester (PC70BM) fullerene. The POTz:IDIC blends showed a typical bicontinuous and uniform nanomorphology; however, the addition of PC70BM to the POTz:IDIC blends led to immiscible domains. When small amounts of PC70BM (8.3–16.7 w%) were incorporated into POTz:IDIC:PC70BM blends, the POTz:IDIC formed a continuous phase and small PC70BM domains were uniformly dispersed into the continuous phase, which resembled raisin bread. The dispersed PC70BM domains enhanced the electron mobility of the POTz:IDIC:PC70BM film and promoted charge balance between holes and electrons, resulting in an enhanced short-circuit current density and fill factor. Notably, the ternary blends with PC70BM exhibited the improved long-term stability in light-soaking tests by reducing the burn-in loss of the devices.
关键词： semi-crystalline polymer,organic solar cells,continuous phase,immiscible blends,ternary blends
更新于2025-09-23 15:21:01
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Light Harvesting at Oblique Incidence Decoupled from Transmission in Organic Solar Cells Exhibiting 9.8% Efficiency and 50% Visible Light Transparency
摘要： For many years, it has been recognized that potential organic photovoltaic cells must be integrated into elements requiring high transparency. In most of such elements, sunlight is likely to be incident at large angles. Here it is demonstrated that light transmission can be largely decoupled from harvesting by optically tailoring an infrared shifted nonfullerene acceptor based organic cell architecture. A 9.67% power conversion efficiency at 50° incidence is achieved together with an average visual transmission above 50% at normal incidence. The deconstruction of a 1D nanophotonic structure is implemented to conclude that just two λ/4 thick layers are essential to reach, for a wide incidence angle range, a higher than 50% efficiency increase relative to the standard configuration reference. In an outdoor measurement of vertically positioned 50% visible transparent cells, it is demonstrated that 9.80% of sunlight energy can be converted into electricity during the course of 1 day.
关键词： transparent solar cells,near-infrared ternary blends,1-D nanophotonic structures,optical trapping,oblique incidence
更新于2025-09-19 17:13:59
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Largely improved bulk-heterojunction morphology in organic solar cells based on a conjugated terpolymer donor via a ternary strategy
摘要： In this wok, a D1-A-D2-A random terpolymer donor PFBT4T-BDT10 was synthesized for application in organic solar cells (OSCs). With fullerene derivative PC71BM as the acceptor, the PFBT4T-BDT10:PC71BM binary active layer delivered a very low short-circuit current (Jsc) of 5.87 mA cm?2 and a low fill factor (FF) of 53.8%, leading to a poor efficiency of 2.40%. With a small fused ring electron acceptor IDIC as the third component, the PFBT4T-BDT10:IDIC:PC71BM ternary active layers displayed a largely elevated efficiency up to 10.17%, corresponding to significantly elevated Jsc of 21.12 mA cm?2 and FF of 63.9%. The favorable morphology and the broader absorption are the main reasons for the elevation of Jsc. It was found that IDIC could act as a morphology regulator in the ternary blends, not only restricting the aggregation of PC71BM but also maintaining the crystallization of PFBT4T-BDT10. Our work highlights the importance of ternary blend strategy for random terpolymers.
关键词： Organic solar cells,Ternary blends,Random terpolymer
更新于2025-09-12 10:27:22