Affiliation:
1. Institute for Chemical and Bioengineering ETH Zurich Zurich 8093 Switzerland
2. Laboratory of Photonics and Interfaces Institute of Chemical Sciences and Engineering EPFL Lausanne 1015 Switzerland
3. Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
Abstract
AbstractSelf‐powered skin optoelectronics fabricated on ultrathin polymer films is emerging as one of the most promising components for the next‐generation Internet of Things (IoT) technology. However, a longstanding challenge is the device underperformance owing to the low process temperature of polymer substrates. In addition, broadband electroluminescence (EL) based on organic or polymer semiconductors inevitably suffers from periodic spectral distortion due to Fabry–Pérot (FP) interference upon substrate bending, preventing advanced applications. Here, ultraflexible skin optoelectronics integrating high‐performance solar cells and monochromatic light‐emitting diodes using solution‐processed perovskite semiconductors is presented. n–i–p perovskite solar cells and perovskite nanocrystal light‐emitting diodes (PNC‐LEDs), with power‐conversion and current efficiencies of 18.2% and 15.2 cd A−1, respectively, are demonstrated on ultrathin polymer substrates with high thermal stability, which is a record‐high efficiency for ultraflexible perovskite solar cell. The narrowband EL with a full width at half‐maximum of 23 nm successfully eliminates FP interference, yielding bending‐insensitive spectra even under 50% of mechanical compression. Photo‐plethysmography using the skin optoelectronic device demonstrates a signal selectivity of 98.2% at 87 bpm pulse. The results presented here pave the way to inexpensive and high‐performance ultrathin optoelectronics for self‐powered applications such as wearable displays and indoor IoT sensors.
Funder
Innosuisse - Schweizerische Agentur für Innovationsförderung
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
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