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The presence of multiple independent sensing parameters in a single device isthe key conceptual advantage of sensor devices based on an organic thin filmtransistor (OTFT) over simple organic chemiresistors. Practically, however,these multiple parameters must first be extracted from the electricalcharacteristics of the OTFTs and, thus, they are not immediately apparent. Toexploit the advantage of OTFT sensors, we require a measurement technology toextract these parameters in real time. Here, we introduce an efficient,cost-effective system that is a faster and more compact alternative to theexpensive and cumbersome laboratory-based instruments currently available.The characterisation system presented here records the electric behaviour ofOTFTs in the form of its "saturated transfer characteristics" multipletimes per second for virtually unlimited periods of time, with the option tomultiplex up to 20 devices in parallel. By applying a bespoke algorithm tothe measured transfer characteristics, the system then extracts, in realtime, several underlying transistor parameters (on- and off-current,threshold voltage, and charge carrier mobility). Tests were conducted on theexample of a poly(thieno[3,2-b]thiophene) (PBTTT) OTFT exposed to ethanolvapour. The system extracts the underlying OTFT parameters with very lownoise without introducing apparent correlations between independentparameters as an artefact

An electrical characterisation system for the real-time acquisition of multiple independent sensing parameters from organic thin film transistors