Abstract
Abstract The facile in-situ fabricated interfacial layers for highly efficient and stable polymer solar cells (PSCs) have garnered extensive attention. Herein, low-temperature in-situ prepared ZnO derived from zinc acetylacetonate (Zn(acac) 2 ) is used as electron extraction cathode interfacial layer (CIL) in inverted PSCs. The chemical component, optical features, electron mobility and charge transfer properties of the low-temperature in-situ obtained ZnO CIL are detailedly studied by X-ray photoelectron spectroscopy (XPS), ultraviolet visible (Uvâvis) spectra, space charge limited current (SCLC) and time-resolved photoluminescence (TRPL) measurements, respectively. The obtained ZnO layer demonstrates outstanding optical and electrical properties. Via fine-tuning the parameters of film processing, a record high power conversion efficiency (PCE) up to 11.65% is obtained for PBDB-T:IT-M-based PSCs, indicating ZnO significantly facilitates carrier transportation and induces fast charge transfer to electrode. The low-temperature in-situ prepared ZnO CIL can be further applied into the large-area and flexible PSCs.
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