Ternary Organic Blend Approaches for High Photovoltaic Performance in Versatile Applications. Issue 38 (27th August 2019)

• Record Type: Journal Article
• Authors: Nam, Minwoo; Kang, Joo‐han; Shin, Jisu; Na, Jihye; Park, Yunjae; Cho, Junhee; Kim, Byunghoon; Lee, Hyun Hwi; Chang, Rakwoo; Ko, Doo‐Hyun
• Is Part Of: Advanced energy materials. Volume 9:Issue 38(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-27
• Subjects: indoor power source -- morphology -- nonfullerene acceptors -- organic photovoltaics -- ternary blends; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201901856
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Ternary blend approaches are demonstrated as a universal means to improve overall performance of organic photovoltaics (OPVs) in both indoor and outdoor conditions. A comparative study on two donors:one acceptor (2D:1A) and one donor:two acceptors (1D:2A) ternary blends shows that both approaches are universally effective for indoor and outdoor operation; the 1D:2A devices incorporating a nonfullerene acceptor (NFA) benefit from less charge recombination and higher power conversion efficiencies (PCEs) for various irradiation conditions, while the performance of the 2D:1A blends depends on the emission spectrum of the incident light source. The synergistic merits of NFAs and ternary structure in the 1D:2A ternary OPVs secure better performance and generality regardless of the incident lighting. A combination of experimental and theoretical analyses unveils that NFAs optimize packing and arrangement of molecules to build efficient cascade ternary junctions in the 1D:2A blends, which can be important design guidelines for the third component in ternary OPVs. The optimized 1D:2A ternary OPV exhibits a new record PCE of 25.6% under a 200 lux light‐emitting diode (LED) and 26.4% under a 1000 lux LED, and superior durability under industrial relevant thermal stress, suggesting new opportunities in diverse practical applications challenging the currently dominant PV technologies. Abstract : This study provides important guidelines for the third component in ternary organic photovoltaics (OPVs), involving high molecular compatibility with main components and favorable ternary junction formation with cascade band alignment. With a high efficiency in any irradiation conditions (≈26.4% under light‐emitting diodes) and superior thermal durability, ternary OPVs incorporating nonfullerene acceptors open new opportunities in broad practical applications.