Abstract
Abstract Single-phase, near granular shaped quaternary chalcopyrite Cu(In 1− x Al x )Se 2 nanocrystals (0 ⩽ x ⩽ 0.5) were synthesized by a facile, air pressure hot-injection process using triethylenetetramine(TETA)-assisted triethylene glycol solution, CuCl 2 ·2H 2 O, InCl 3 ⋅4H 2 O, AlCl 3 ⋅6H 2 O and Se powder as precursors, polyvinylpyrrolidone as dispersant, at solution temperature 270 °C. The TETA-assisted role, the optimum TETA added amount and the effects of reaction solution temperatures were investigated based on X-ray diffraction, energy dispersive X-ray analyses, transmission electron microscopy, high resolution transmission electron microscopy and selected area electron diffraction. The band gap energy tuning with varying In/Al atomic ratios in feeding solutions was characterized by X-ray diffraction, inductively coupled plasma mass spectrum, Raman spectroscopy and UV–vis–NIR absorption.
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