Thermally Stable Dibenzo[def,mno]chrysene‐Based Polymer Solar Cells: Effect of Thermal Annealing on the Morphology and Photovoltaic Performances

Abstract

The photovoltaic performances of dibenzo[def,mno]chrysene‐based polymer (poly(2,2′‐thiophenevinylenthiophene‐4,10‐[6,12‐bis(2‐decyltetradecyloxy)‐dibenzo[def,mno]chrysene]) (PTVTC) or poly(4,10‐bithiophene‐6,12‐bis(2‐decyltetradecyloxy)‐dibenzo[def,mno]chrysene) (PTTC)) solar cells as a function of thermal annealing temperatures from 100 to 180 °C are reported. Interestingly, the solar cells with PTTC containing two thiophene units, have superior thermal stability compared to the PTVTC:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) solar cells, in which the PTVTC has two thiophene and vinyl groups. Atomic force microscopy, transmission electron microscopy, and X‐ray diffraction demonstrate that morphological stability of PTTC:PC71BM blend films conduces thermally stable photovoltaic performances of PTTC solar cells. Therefore, the PTTC:PC71BM bulk heterojunction solar cells have highly stable efficiency, retaining 97% of its original power conversion efficiency value without PCBM clusters in the blend films even at elevated temperatures. There have been no previous reports on the thermal stability aspect of dibenzo[def,mno]chrysene‐based polymer solar cells so far.

Conjugated polymers and small molecules containing the thiophene–vinylene–thiophene (TVT) unit for organic photovoltaic applications

“…When larger p-conjugated quinacridone (QA) and dibenzo[def,mno]chrysene building blocks were used as the acceptor units, the obtained polymers D19 and D20 exhibited unsatisfactory efficiencies when paired with acceptor PC 71 BM. 60,61 Chochos et al designed the 4,4-diuoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) unit and synthesized an ultralow bandgap (E g = 1.15 eV) polymer D21. Although D21 with a unique molecular structure exhibited a low PCE of 1.10%, it showed appropriate potential in near-infrared organic electronics.…”

2,9-Dibenzo[b,def]chrysene as a building block for organic electronics

“…1,2,3 In fact, many of them possess synthetic handles like halogens and ketone that allow easy chemical functionalization and modifications of their electronic properties. Recently, vat orange 3 (4,10dibromoanthanthrone) has been used as the starting material for several -conjugated molecules and polymers for multiple applications, including field-effect transistor, [4][5][6][7] light-emitting diodes, 8,9 aggregation-induced emission (AIE), 10 solar cells [11][12][13][14][15][16][17] and singlet fission. 18,19 This dye showed good versatility as it can be functionalized at the 4, 6, 10 and 12 positions to yield materials with a wide range of properties.…”