Improving the performance of photodetectors based on MAPbBr3 film optimization and the MeOP-DSF hole-transport layer

Abstract

Perovskite photodetectors (PDs) have garnered substantial research interest owing to their broad spectral response capability and solution-processable attributes. However, the widespread use of Spiro-OMeTAD as the hole transport layer (HTL) faces the issue of energy-level mismatch with perovskites, restricting the performance optimization of PDs. Herein, a novel organic HTL (MeOP-DSF) with a planar conjugated structure and molecular surface adaptability was introduced in perovskite PDs, exhibiting excellent bandgap alignment with perovskites. Combined with an optimized MAPbBr₃ film, the performance of PDs can be significantly enhanced by improving the carrier-transport efficiency and interfacial charge separation effectiveness. Through the optimization of anti-solvent engineering and annealing process parameters, smooth and dense MAPbBr₃ films were prepared. Subsequently, the introduction of MeOP-DSF with optimized band alignment promoted interfacial charge extraction and suppressed defect-mediated recombination. The MeOP-DSF-based PDs exhibit a responsivity of 0.25 A W⁻¹, an EQE of 83.3%, a detectivity of 2.1 × 10¹² Jones (467.6% increase), a low dark current of 1.3 × 10⁻¹¹ A, and a fast response rise time of 39 µs, outperforming the Spiro-OMeTAD-based devices. This provides a technical paradigm for the design and performance breakthrough of high-efficiency perovskite optoelectronic devices and validates the potential of organic HTL materials, thus presenting a universal strategy for high-performance PDs.