The diversity of brain functions depend on the release of neurotransmitters in chemical synapses. The back gated three terminal field effect transistors (FETs) are auspicious candidates for the emulation of biological functions to recognize the proficient neuromorphic computing systems. In order to encourage the hysteresis loops, we treated the bottom side of MoTe₂ flake with deep ultraviolet light in ambient conditions. Here, we modulate the short-term and long-term memory effects due to the trapping and de-trapping of electron events in few layers of a MoTe₂ transistor. However, MoTe₂ FETs are investigated to reveal the time constants of electron trapping/de-trapping while applying the gate-voltage pulses. Our devices exploit the hysteresis effect in the transfer curves of MoTe₂ FETs to explore the excitatory/inhibitory post-synaptic currents (EPSC/IPSC), long-term potentiation (LTP), long-term depression (LTD), spike timing/amplitude-dependent plasticity (STDP/SADP), and paired pulse facilitation (PPF). Further, the time constants for potentiation and depression is found to be 0.6 and 0.9 s, respectively which seems plausible for biological synapses. In addition, the change of synaptic weight in MoTe₂ conductance is found to be 41% at negative gate pulse and 38% for positive gate pulse, respectively. Our findings can provide an essential role in the advancement of smart neuromorphic electronics.

We fabricated a solution-processed semitransparent organic solar cell from a transparent conductive polymer electrode. The top metal electrode was replaced with a transparent conductive polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). The advantage of using the PEDOT:PSS conductive polymer is that organic solar cell (OPV) can be fabricated from solution process at plastic-compatible low temperature (<200°C). In addition, due to the absence of an opaque top metal electrode, the final OPVs exhibit semitransparency. The transmittance (T) of the final OPV was adjusted by changing the concentration of the organic materials in a solvent. As the concentration of the organic materials increased from 1.5 to 3.1%, the average weighted solar transmittance decreased from 53.9 to 45.2%. I-V characteristics of the OPVs with various transmittances were measured under the AM1.5G 100mW/m² solar simulator, and the conversion efficiency was 1.2, 2.0, 1.3% for the OPV with T of 53.9, 51.2, 45.2%, respectively.