Mitigating the Efficiency Loss of Organic Photovoltaic Cells Using Phosphomolybdic Acid‐Doped PEDOT:PSS as Hole Transporting Layer

Abstract

A phosphomolybdic acid (PMA)‐doped poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) hole transporting layer (HTL) is developed to effectively optimize the anode interface of inverted organic photovoltaic (OPV) devices. Since a deep‐lying work function of HTL is in favor of reducing the interfacial barrier for hole transporting, superior power conversion efficiencies (PCE) of 9.22% and 10.8% are achieved in fullerene‐based and nonfullerene‐based devices in inverted architecture. Thus‐prepared OPV devices also exhibit excellent photostability and retain 85% of the initial PCE after 1000 h of irradiation under 100 mW cm−2 irradiation. The overall result suggests the practicability and mitigation of efficiency loss when replacing the conventional PEDOT:PSS with PMA‐doped PEDOT:PSS as HTL to fabricate highly efficient, inverted OPV devices.

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“…[ 52 ] However, the subsequent issue arises from the difference in the work functions of PEDOT:PSS and MoO 3 , leading to variations in the V OC . [ 53,54 ] In PV2000:PC 61 BM system, V OC decreases from 0.81 V (MoO 3 , Cell B) to 0.77 V (PEDOT:PSS, Cell C). Simultaneously, due to the thickness and resistance of PEDOT:PSS, it also affects the FF, decreasing from 73.3% (MoO 3 , Cell B) to 65.2% (PEDOT:PSS, Cell C), resulting in a decrease in PCE to 7.33% (Cell C).…”

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“…Bulk heterojunction (BHJ) OSCs are a promising photovoltaic technology with great advantages of solution processing, low cost and flexibility. [60][61][62][63][64] The active layer of the OSC device is a hybrid film of donor and acceptor materials. [65][66][67][68] Over the last few years, the development of active layer materials has increased the power conversion efficiency (PCE) of OSCs from 10% to over 19%.…”

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“…In the context of Organic Photovoltaics (OPVs), PEDOT:PSS has found application both as a semi-transparent electrode Lee et al (2020) and as a hole transport layer Miranda et al (2021); Chang et al (2023); de Jesus Bassi et al (2021). This polymeric conductive ink has also found relevance in other devices, including batteries del Olmo et al (2022), supercapacitors Yoonessi et al (2019), and Organic Light Emitting Diodes (OLED) Cinquino et al (2022); Gu et al (2019).…”