Neurologic function implemented soft organic electronic skin holds promise for wide range of applications, such as skin prosthetics, neurorobot, bioelectronics, human-robotic interaction (HRI), etc. Here, we report the development of a fully rubbery synaptic transistor which consists of all-organic materials, which shows unique synaptic characteristics existing in biological synapses. These synaptic characteristics retained even under mechanical stretch by 30%. We further developed a neurological electronic skin in a fully rubbery format based on two mechanoreceptors (for synaptic potentiation or depression) of pressure-sensitive rubber and an all-organic synaptic transistor. By converting tactile signals into Morse Code, potentiation and depression of excitatory postsynaptic current (EPSC) signals allow the neurological electronic skin on a human forearm to communicate with a robotic hand. The collective studies on the materials, devices, and their characteristics revealed the fundamental aspects and applicability of the all-organic synaptic transistor and the neurological electronic skin.

Organic solar cells (OSCs), particularly made based on solution processing methods, have made significant progress over the past decades through the concurrent evolution of organic photovoltaic materials and device engineering. Recently, high power conversion efficiencies around 18% and over 16% have been demonstrated in both rigid and flexible OSCs, respectively. While most of the OSC research has centered on efficiency and cost, their emerging and potential usages in many critical applications, particularly in biomedical fields have been rising. In this mini-review, we will briefly discuss the high-performance organic photovoltaic materials and the representative flexible OSCs to give a scope on the recent rapid development of OSCs. Besides, we will review some progress on the applications of OSCs in biomedical devices and integrated systems. The potential challenges associated with integrating OSCs for biomedical devices will be put forward.