Multidimensional Perovskites for High Detectivity Photodiodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 36000490.
- Also identified by DOI 10.1002/adma.202205261.
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Abstract
Low-dimensional perovskites attract increasing interest due to tunable optoelectronic properties and high stability. Here, it is shown that perovskite thin films with a vertical gradient in dimensionality result in graded electronic bandgap structures that are ideal for photodiode applications. Positioning low-dimensional, vertically-oriented perovskite phases at the interface with the electron blocking layer increases the activation energy for thermal charge generation and thereby effectively lowers the dark current density to a record-low value of 5 × 10<sup>-9</sup> mA cm<sup>-2</sup> without compromising responsivity, resulting in a noise-current-based specific detectivity exceeding 7 × 10<sup>12</sup> Jones at 600 nm. These multidimensional perovskite photodiodes show promising air stability and a dynamic range over ten orders of magnitude, and thus represent a new generation of high-performance low-cost photodiodes.