High‐Performance Ternary Semitransparent Polymer Solar Cells with Different Bandgap Third Component as Non‐Fullerene Guest Acceptor

Abstract

Ternary semitransparent polymer solar cells (ST‐PSCs) have great potential to simultaneously improve the power conversion efficiency (PCE) and average visible transmittance (AVT). Non‐fullerene acceptor IHIC was synthesized by a simple one‐step process under low cost and had an A‐D‐A structure similar to ITIC and IT‐4F. Ternary device based on PM6:Y6:IHIC (20%) demonstrated higher hole and electron mobility (2.78, 3.12 × 10−4 cm2 V−1 S−1) and more balanced charge transport properties (μe/μh = 1.12) than the host binary device, and the ternary ST‐PSC demonstrated a PCE of 12.18% and AVT of 27.07%. Ternary PSCs with 20% ITIC or IT‐4F also exhibited more balanced μe/μh ratios (1.31 and 0.85), but with slightly enhanced short‐current circuit density (JSC) and reduced AVT (23–24%), mainly owing to unavoidable absorption of third component in the visible region. Our conclusion in this work was that the little A‐D‐A non‐fullerene acceptor could improve ternary blend film morphology and charge transport channels and enhanced JSC and PCE, and PM6:Y6:IHIC (20%) with high AVT over 27% and PCE over 12% was more suitable in ST‐PSCs than PM6:Y6:ITIC/IT‐4F (20%).

P‐type Polymers in Semitransparent Organic Photovoltaics

“…[72][73][74] For example, Wang and co-workers employed ITIC, ITIC-4F or IHIC as the third components into PM6:Y6 binary blend. [75] All of the three third components can balance the hole and electron transport in ternary blend, leading to improved PCEs relative to the binary blend. The main absorption bands of ITIC and ITIC-4F are in visible region, while that of IHIC is much red-shifted and belongs to NIR region, thus the PM6:Y6:IHIC-based STOPVs show higher AVT.…”

“…Besides, functional third components can also be incorporated into binary active layers to improve the performance of STOPVs by optimizing the absorption, morphology and/or charge transport [72–74] . For example, Wang and co‐workers employed ITIC, ITIC‐4F or IHIC as the third components into PM6:Y6 binary blend [75] . All of the three third components can balance the hole and electron transport in ternary blend, leading to improved PCEs relative to the binary blend.…”

P‐type Polymers in Semitransparent Organic Photovoltaics

“…Besides, functional third components can also be incorporated into binary active layers to improve the performance of STOPVs by optimizing the absorption, morphology and/or charge transport [72–74] . For example, Wang and co‐workers employed ITIC, ITIC‐4F or IHIC as the third components into PM6:Y6 binary blend [75] . All of the three third components can balance the hole and electron transport in ternary blend, leading to improved PCEs relative to the binary blend.…”

Naphthalimide Molecular‐Doped Zinc Oxide Cathode Interfacial Layer Inhibits Charge Trapping in Organic Solar Cells

“…[1][2][3][4] Intensive efforts have been devoted to enhancing the power conversion efficiency (PCE) by developing matchable polymer donors and small molecule acceptors, regulating the phase separation morphology, optimizing the device interface, and so on. [5][6][7][8][9] Recently, the certified PCEs of single-junction OSCs have exceeded 19%. [10][11][12] The synthetic tailoring of photoactive materials is the critical factor in achieving the breakthrough in performance.…”