Perovskite/organic tandem device to realize light detection and emission dual function

Developing highly integrated smart optoelectronic systems is vital to modern technology, yet critically challenging. This study introduces a tandem device that incorporates an organic photodiode (OPD) and a perovskite light emitting diode (PeLED), enabling simultaneous light detection and emission in one compact device, prepared by all solution-processed fabrication process. We discover that precise control of interfacial properties plays a critical role in establishing the all-solution processed OPD/PeLED multi-layered dual-function system and the interface is critical for charge transport, recombination, and generation. The integrated structure allows for straightforward switching light detection and emission function selectively by controlling the polarity of the external bias. The optoelectronic performance of the dual-function tandem device is comparable to that of each control diode in terms of light sensing and emitting, i.e., the device achieves a responsivity of 94 mA/W at 850 nm under −1.0 V and a luminance of 1319 cd/m2 at 516 nm under 7 V, which is comparable to 101 mA/W and 1983 cd/m2 for the control OPD and PeLED under similar conditions. This research demonstrates the feasibility and versatility of solution-processed semiconductors in designing multifunctional optoelectronic devices for miniaturized and highly integrated systems.