High Voc ternary nonfullerene polymer solar cells with improved efficiency and good thermal stability

Investigation of different degradation pathways for organic photovoltaics at different temperatures

“…In order to shorten these experiments, higher temperatures (>85 °C) are often employed to accelerate degradation mechanisms in OPV devices, reducing degradation test time to less than a month. 12,13,34 A wide range of elevated temperatures have been used to accelerate degradation, including 80 °C, 35–37 85 °C, 27,28,30,38–43 90 °C, 44 100 °C, 13,34,45 110 °C, 46 120 °C, 47,48 130 °C, 49 140 °C, 50 150 °C, 51–53 160 °C, 44 180 °C, 12 and even up to 200 °C. 44…”

PTB7-Th-Based Organic Photovoltaic Cells with a High VOC of over 1.0 V via Fluorination and Side Chain Engineering of Benzotriazole-Containing Nonfullerene Acceptors

“…Further optimizing D and A 2 units to indacenodithiophenes (IDT) and rhodanine (R), the final molecule O-IDTBR obtained a device efficiency of 9.9% ( V OC = 1.02 V). By strong device engineering and a ternary strategy, PTB7-Th :O-IDTBR achieves the PCE values of 10.8 and 11.6%. , Notably, in addition to O-IDTBR, there is still a lack of suitable acceptors to fabricate high-voltage PTB7-Th :NFA-based devices, and it is a large challenge to meanwhile realize a V OC exceeding 1.0 V and a device efficiency of over 10% for PTB7-Th -based OPV. , …”

“…By strong device engineering and a ternary strategy, PTB7-Th:O-IDTBR achieves the PCE values of 10.8 and 11.6%. 22,23 Notably, in addition to O-IDTBR, there is still a lack of suitable acceptors to fabricate highvoltage PTB7-Th:NFA-based devices, and it is a large challenge to meanwhile realize a V OC exceeding 1.0 V and a device efficiency of over 10% for PTB7-Th-based OPV. 24,25 In our previous work, some high-performance benzotriazole (BTA)-based NFAs were developed and achieved a high V OC of ∼ 1.2 V. 26−29 The BTA-typed acceptors exhibited increased solubility in organic solvents, matched energy levels, suitable strong absorption, and good compatibility with many donors, thereby achieving high V OC -based OPVs.…”

Ternary Polymer Solar Cells with Low-Cost P3HT as the Second Donor by the Complementary Absorption Region from Long-Wavelength to Medium-Wavelength Regions Forming Cascaded HOMO and LUMO Energy Levels

“…13,14 Binary PSCs with PTB7-Th as the donor and O-IDTBR as the acceptor have been extensively reported. 15,16 In this paper, the common polymer donor P3HT was incorporated into PTB7-Th-based binary films as the third component material. Compared with PTB7-Th, P3HT showed efficient medium-wavelength light absorption and shallow highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels, which facilitated complementary light absorption from long-wavelength to medium-wavelength regions and formed cascaded HOMO and LUMO energy levels between P3HT, PTB7-Th, and O-IDTBR, as shown in Figure 1.…”