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“Background Currently, nontoxic and earth-abundant I2-II-IV-VI4 quaternary compounds
such as Cu2ZnSnS4 and Cu2ZnSnSe4 (CZTSe) have been considered as the most promising ‘next-generation’ photovoltaic materials to substitute for CIGSe absorber materials, due to their excellent properties such as high absorption coefficients (1 × 105 cm−1) [1–3], suitable absorption bandgap for the solar spectrum, high radiation stability, and considerable cell efficiency [4–6]. Various methods have been used for the preparation of CZTSe materials, including physical methods [7–10] and wet chemical routes [11–15]. Wet chemical routes are more prevalent due to their convenient operability, achievable by using traditional instruments, and low cost. CZTSe nanocrystals (NCs) are usually covered with long alkyl chain ligands to shield the surface of the NC, which can realize homogeneous nucleation and enable easy solution processibility for fabrication.