Indoor Self-Powered Perovskite Optoelectronics with Ultraflexible Monochromatic Light Source

Area of Science:

• Materials Science
• Electronics
• Optoelectronics

Background:

• Self-powered skin optoelectronics on ultrathin polymer films are key for next-generation Internet of Things (IoT) technology.
• Low process temperatures of polymer substrates limit device performance.
• Broadband electroluminescence (EL) suffers from spectral distortion due to Fabry-Pérot (FP) interference when bent.

Purpose of the Study:

• To develop ultraflexible skin optoelectronics integrating high-performance solar cells and monochromatic light-emitting diodes.
• To address the limitations of low process temperatures and spectral distortion in polymer-based optoelectronics.
• To demonstrate perovskite-based devices for self-powered applications.

Main Methods:

• Solution-processed perovskite semiconductors were used to fabricate n-i-p perovskite solar cells and perovskite nanocrystal light-emitting diodes (PNC-LEDs).
• Devices were fabricated on ultrathin polymer substrates with high thermal stability.
• Narrowband EL was employed to eliminate FP interference.

Main Results:

• Record-high power-conversion efficiency of 18.2% for ultraflexible perovskite solar cells.
• Current efficiency of 15.2 cd A⁻¹ for PNC-LEDs.
• Bending-insensitive spectra with eliminated FP interference, even under 50% mechanical compression.
• Photo-plethysmography demonstrated 98.2% signal selectivity at 87 bpm.

Conclusions:

• The developed ultraflexible perovskite optoelectronics overcome previous performance limitations.
• These devices enable bending-insensitive spectral characteristics for robust applications.
• The technology paves the way for inexpensive, high-performance ultrathin optoelectronics for self-powered wearable displays and indoor IoT sensors.