CuInSe₂ Quantum Dots Hybrid Hole Transfer Layer for Halide Perovskite Photodetectors

Summary, in English

A novel hybrid hole transport layer (HTL) of CuInSe₂ quantum dots (QDs)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was developed to enhance the performance of halide metal perovskite (MAPbI₃)-based photodetectors. The introduction of CuInSe₂ QDs not only improved the wettability of the PEDOT:PSS HTL for the growth of perovskite crystals but also facilitated the transportation of holes from the perovskite to the HTL. As a result, both responsivity and detectivity of the device were increased dramatically by CuInSe₂ QDs hybrid HTL, showing excellent photoresponsivity of 240 mA/W, larger ratio of photocurrent density to dark current density of 4.1 × 10⁶, fast on-off switching properties of <0.02 s, and remarkable detectivity values of 1.02 × 10¹³ Jones at 580 nm and above 5.01 × 10¹² Jones over the visible light region without an external bias voltage. In addition, the photodetectors also showed excellent thermal stability in the range of 10-110 °C. Therefore, a unique design idea of a hole transport material would be an anticipated direction for efficient halide metal perovskite-based devices.

• Author: Ruiqi Guo; Fei Huang; Kaibo Zheng; Tönu Pullerits; Jianjun Tian
• Department/s: Chemical Physics; NanoLund: Centre for Nanoscience
• Publishing year: 2018-10-25
• Language: English
• Pages: 35656-35663
• Publication/Series: ACS Applied Materials and Interfaces
• Volume: 10
• Issue: 41
• Links: http://dx.doi.org/10.1021/acsami.8b13777
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Materials Chemistry; Condensed Matter Physics (including Material Physics, Nano Physics)
• Keywords: CuInSe QDs; PEDOT:PSS; perovskite; photodetector; quantum dots
• Status: Published
• ISBN/ISSN/Other: ISSN: 1944-8244