High Efficiency Nonfullerene Polymer Solar Cells with Thick Active Layer and Large Area

Abstract

In this work, high-efficiency nonfullerene polymer solar cells (PSCs) are developed based on a thiazolothiazole-containing wide bandgap polymer PTZ1 as donor and a planar IDT-based narrow bandgap small molecule with four side chains (IDIC) as acceptor. Through thermal annealing treatment, a power conversion efficiency (PCE) of up to 11.5% with an open circuit voltage (V ) of 0.92 V, a short-circuit current density (J ) of 16.4 mA cm , and a fill factor of 76.2% is achieved. Furthermore, the PSCs based on PTZ1:IDIC still exhibit a relatively high PCE of 9.6% with the active layer thickness of 210 nm and a superior PCE of 10.5% with the device area of up to 0.81 cm . These results indicate that PTZ1 is a promising polymer donor material for highly efficient fullerene-free PSCs and large-scale devices fabrication.

Side‐Chain Impact on Molecular Orientation of Organic Semiconductor Acceptors: High Performance Nonfullerene Polymer Solar Cells with Thick Active Layer over 400 nm

“…Thus we systematically fabricated the PTQ10:IDTPC-and PTQ10:IDTCN-based PSCs with varied active-layer thicknesses (ranging from 70 to 505 nm), and the corresponding photovoltaic parameters were summarized in Tables S1 and S2 in the Supporting Information. [10,36,43,62] While for the PSCs based on PTQ10:IDTCN, more dramatic decrease in PCE can be seen; PCE values at 400 and 505 nm are 5.5% and 4.9%, respectively, corresponding to 74% and 56% of its peak value. As for J SC , when the film thickness was increased from 110 to 145 nm, a significantly increase of J SC for the device of IDTPC was observed, and thereafter, the J SC remained within 17.50 ± 0.70 mA cm −2 .…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Compared with traditional fullerene acceptors such as [6,6]-phenyl-C61/C71-butyric acid methyl ester (PC 61 BM/PC 71 BM), PSCs based on the n-OS acceptors have shown great potential in device performance and device stability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Compared with traditional fullerene acceptors such as [6,6]-phenyl-C61/C71-butyric acid methyl ester (PC 61 BM/PC 71 BM), PSCs based on the n-OS acceptors have shown great potential in device performance and device stability.…”

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

“…The relatively large J sat and G max of the optimized ternary OPVs should be attributed to the enhanced photon harvesting of active layers with 50 wt% IT‐2F in acceptors. Exciton dissociation efficiency (η d ) and charge collection efficiency (η c ) can be evaluated by J ph / J sat values under the short‐circuit and maximum power output conditions, respectively . The η d and η c of IT‐2F‐based binary OPVs are larger than those of the optimized ternary OPVs and T6Me‐based binary OPVs, which can well support the relatively high FF of IT‐2F‐based binary OPVs.…”

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

“…However, low electron mobilities of FREAs, when compared to FAs, prevent fabrication thick blends without sacrificing FF. Though, there are some recent examples where FREAs with high mobilities were used in relatively thick (more than 200 nm) OSCs . Furthermore, the current understanding of photochemical processes of FA‐OSCs may not be applicable for FREA‐OSCs, and detailed research on the mechanisms of the photocurrent generation is needed.…”