Enhanced Flexibility and Stability in Perovskite Photodiode–Solar Cell Nanosystem Using MoS<sub>2</sub> Electron-Transport Layer
Dong Hee Shin, Jung Sun Ko, Seoung Kwon Kang, Suk‐Ho Choi
Abstract
Hybrid organic–inorganic perovskites and MoS2 are highly attractive as emerging materials for various kinds of optoelectronic devices. Here, we first report perovskite photodiode–solar cell nanosystems (PPSNs) by employing bilayer (BL) MoS2 and triethylenetetramine-doped graphene (TETA-GR) as the electron-transport layer (ETL) and transparent conductive electrode (TCE), respectively. The rigid/flexible PPSNs exhibit 0.42/0.40 AW–1 responsivity (R), 37.2/80.1 pW Hz–1/2 noise equivalent power, 1.1 × 1010/5.0 × 109 cm Hz1/2 W–1 specific detectivity at a zero-bias photodiode mode (i.e., self-power operation), similar to or even greater than those of previous reports, and 14.27/12.12% power conversion efficiency at a photovoltaic mode. The PPSNs show high long-term stabilities by maintaining more than 78% of the initial R for 30 days. The flexible PPSNs maintain about 80% of the original R during 1000 bending tests at 4 mm radius of curvature, indicating excellent mechanical properties. These high performances result from the enhanced TCE properties, well-matched band offsets at the cathode/ETL/active layer interfaces, and the reduced carrier recombination/charge-transfer resistance by the use of TETA-GR TCE and BL-MoS2 ETL.