p—π Conjugated Polyelectrolytes Toward Universal Electrode Interlayer Materials for Diverse Optoelectronic Devices

Abstract

The development of universal interlayer materials for diverse optoelectronic devices not only decreases the costs in both laboratory research and industrialized production, but also improves the uniformity of different devices so as to facilitate device integration. However, using one material to fabricate diverse devices remains a great challenge. Herein, p‐π conjugation is utilize to replace the commonly used π–π conjugation to develop an unprecedented anode interlayer (AIL) material PCP‐S that can be universally used in diverse optoelectronic devices, including organic light‐emitting diode (OLED), organic solar cell (OSC), and perovskite solar cell (PSC). The unique solubility and the easy adjustment of optoelectronic properties are keys to realize the multiple uses of PCP‐S. First, OSC based on the polyoxometalate (POM)‐doped PCP‐S exhibits a high power conversion efficiency (PCE) of 17.1%, representing the highest efficiency for OSCs using a solution‐processed pH‐neutral AIL. Second, PSC with PCP‐S shows a PCE of 20.1%, which is superior to the device with poly(triaryl amine) (PTAA). Third, OLED possesses a significantly reduced turn‐on voltage from 3.8 to 2.8 V by incorporating the PCP‐S AIL. To the best of the authors’ knowledge, this is the first example of a universal AIL material to realize multiple applications.

Powering the Future: A Critical Review of Research Progress in Enhancing Stability of High‐Efficiency Organic Solar Cells

“…Wang et al synthesized a novel p-𝜋 conjugated HTL material PCP-S, which is pH-neutral and can be widely used in various optoelectronic devices. [132] When applied to OSCs, PCP-S could enhance the storage stability of the devices. Yang et al used a new conjugated polyelectrolytes electrolyte composite PIDT-F:phosphomolybdic acid (PIDT-F:PMA) as the HTL, which not only showed excellent hole extraction capability but also enhanced the air and light stability.…”

“…synthesized a novel p‐π conjugated HTL material PCP‐S, which is pH‐neutral and can be widely used in various optoelectronic devices. [ 132 ] When applied to OSCs, PCP‐S could enhance the storage stability of the devices. Yang et al.…”

Improving the efficiency of ternary organic solar cells by reducing energy loss

“…[1][2][3][4][5][6][7][8][9] Benefiting from the most advanced non-fullerene acceptors, precise morphology manipulation, and interface engineering, the power conversion efficiency (PCE) of OSCs has exceeded 19% with the best fill factors (FF) over 80%, showing their promising application prospects. [10][11][12][13] The ternary blend strategy has been widely used as a practical and straightforward approach to improve the efficiency of OSCs. [14][15][16] By incorporating a third component, the lightharvesting of blend films could be improved, effectively promoting the short-circuit current density (J SC ).…”

“…1–9 Benefiting from the most advanced non-fullerene acceptors, precise morphology manipulation, and interface engineering, the power conversion efficiency (PCE) of OSCs has exceeded 19% with the best fill factors (FF) over 80%, showing their promising application prospects. 10–13…”

Solution‐Processed Semiconductor Materials as Cathode Interlayers for Organic Solar Cells

“…More importantly, compared to the electrode interlayers constructed based on the interfacial dipole mechanism, the SPSs possess excellent charge transporting ability, which may effectively suppress the problem of charge accumulation when the interlayer thickness increases. [27,28] As a result, the performance of SPS-based interlayers can exhibit great tolerance to the thickness variation, endowing them with good compatibility with large-area processing methods, such as coatings and printings, in which certain thickness variation is unavoidable. [29][30][31] At present, the conducting polymer PDEDOT:PSS and transition metal oxides (TMOs) MoO 3 are the most dominantly used anode interlayers, producing many high PCE values for the field.…”