Abstract
New photodetector structure combining thinned CdTe film with lead-free perovskite photoelectric film was produced and investigated. This setting of the CdTe thickness results in photodetector parameters’ competitiveness to the state-of-the-art in the field of advanced photoelectric materials. The device shows a promising sensitivity of ~40 μA/W, maximum responsivity of 10.6 mA/W at 460 nm, equal rise and fall times of 30 ms, and high linearity (maximum linearization error is less than 0.6 %). However, the optoelectronic performance of CdTe/lead-free perovskite structures integrated with signal processing circuit remains unexplored. For this purpose, Field Programmable Analogue Array (FPAA)-based mixed-signal processing circuit is developed for pulse width modulated electrical signal with duty cycle controlled by the illumination degree of the detecting photoelement. This novel approach guarantees a smooth change of the electrical output at a smooth change of the input illumination between the light and dark switching states and can be practically applied as a precise position detector of moving objects. The paper represents a synergistic connection between microelectronics, electronics, and signal technology.
Highlights
In the last few years, an unprecedented growth of interest in organic-inorganic halide perovskite-based solar cells has been observed due to their distinct combination of high efficiency and easy preparation [1]–[4]
The response of the photodetector to various light intensities is an important evaluation of the device performance, so the photocurrent and voltage against time were measured for different light intensities ranging from dark to 500 cd/m2 (73 μW/cm2)
An extensive analysis of these relations is not provided and the focus was put on the basic response characteristics of the photodetector to different light stimuli measured according to the setup shown in Fig. 1(b), which are important for the correct work of the Field Programmable Analogue Array (FPAA) circuit
Summary
In the last few years, an unprecedented growth of interest in organic-inorganic halide perovskite-based solar cells has been observed due to their distinct combination of high efficiency and easy preparation [1]–[4]. Their stability is still an issue, especially as related to the novel lead-free perovskites, which elemental composition is in line with the requirements for environmentally friendly manufacturing. The well-studied CdTebased solar cells exhibit long-term stability of the electrical characteristics due to their photochemical stability.
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