Abstract
We report efficient photoconductivity multiplication in few-layer 2H-MoTe(2) as a direct consequence of an efficient steplike carrier multiplication with near unity quantum yield and high carrier mobility (∼45 cm(2) V(-1) s(-1)) in MoTe(2). This photoconductivity multiplication is quantified using ultrafast, excitation-wavelength-dependent photoconductivity measurements employing contact-free terahertz spectroscopy. We discuss the possible origins of efficient carrier multiplication in MoTe(2) to guide future theoretical investigations. The combination of photoconductivity multiplication and the advantageous bandgap renders MoTe(2) as a promising candidate for efficient optoelectronic devices.