Broadening the light absorption range via PBDB-T to improve the power conversion efficiency in ternary organic solar cells

High-Efficiency and Stable Organic Solar Cells with Stacked LiF and Organic Electrolytes as Cathode Interface Layers

“…In order to further understand the action mechanism of LiF at the interface layer, the dark J – V curves of devices with different electron transport layers were studied according to the diode model. As shown in Figure , in the low-voltage region, the curve is related to the shunt resistance caused by the interface contact barrier . It can be seen that the leakage current of L-PFN-Br and L-PDINO devices is significantly lower than that of PFN-Br, PDINO, and LiF devices, indicating that the L-PFN-Br and L-PDINO interface layer can effectively prevent the penetration of electrode metal elements into the active layer, prevent the electrode from contacting with the active layer, and inhibit the leakage current caused by trap …”

“…As shown in Figure 8, in the low-voltage region, the curve is related to the shunt resistance caused by the interface contact barrier. 39 It can be seen that the leakage current of L-PFN-Br and L-PDINO devices is significantly lower than that of PFN-Br, PDINO, and LiF devices, indicating that the L-PFN-Br and L-PDINO interface layer can effectively prevent the penetration of electrode metal elements into the active layer, prevent the electrode from contacting with the active layer, and inhibit the leakage current caused by trap. 40 In medium positive voltage, the ideality factor and reverse saturation current density are calculated by fitting the exponential curve segment, which are summarized in Table S2.…”

High‐Performance Ternary Polymer Solar Cells Enabled by a New Narrow Bandgap Nonfullerene Small Molecule Acceptor with a Higher LUMO Level

“…[27] When taking polymer donor guest such as poly[(2,6-(4,8-bis(5-(2-thioethylhexyl-3-fluoro) thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione)] and poly[(2,6-(4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′di-2-thienyl-5′7′-bis-(2-ethylhexyl)benzo[1′2′-c:4′5′-c′]dithiophene-4,8-dione))] (PBDB-T) to form a ternary cell, the broadened absorption spectrum can improve the value of J SC and the optimized film morphology can benefit charge transfer, helpful to obtain a high value of FF, thus enabling a highperformance ternary device. [28,29] As the most popular binary systems, such as 2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9diundecyl-3,9-diundecyl-12,13-dihydro- [1,2,5]thiadizolo [3,4- [3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diyliene))dimalononitrile)) (PBDB-T:Y6), PTB7-Th:IEICO-4F and analogous systems, the ternary strategy is also a much promising method to improve photoelectric conversion efficiency. Wang et al reported that adding a narrow bandgap NFA guest 3,9-bis(2methylene-(…”

Synergistic effect of CdSe quantum dots (QDs) and PC61BM on ambient-air processed ZnO QDs/PCDTBT: PC61BM:CdSe QDs/MoO3 based ternary organic solar cells

“…However, the major drawback of the OSCs that prevents their commercialization is the extremely poor efficiency compared to inorganic solar cells using Si, CdTe and copper indium gallium selenide (CIGS) materials [9]. Recently, nanomaterials engineering combined with thin film and device structural engineering techniques have been explored for improving the efficiencies of the OSCs [10][11][12][13][14]. In general, OSCs are fabricated in bulk heterojunction (BHJ) or binary (blended photoactive p-type and n-type polymer) structures comprising various layers including the electron transport layer (ETL), photoactive layer and hole transport layer (HTL), where every layer plays a significant role in determining the performance of the OSCs [15].…”

“…In general, the efficiency of binary OSCs is smaller than that of inorganic solar cells due to lower conductivity and slower charge transportation of the organic materials [32,33]. To improve efficiency, several nanostructure materials are blended with organic photoactive materials to improve the charge transportation and optical properties in the form of ternary OSCs [14,24,[34][35][36]. Au [30] and Ag [37] metal nanoparticle and graphene nanoflake [38,39] blended active materials are widely used in binary OSCs to form ternary OSCs.…”