Santos Calink I L, S Machado Wagner, Wegner Karl David, Gontijo Leiriana A P, Bettini Jefferson, Schiavon Marco A, Reiss Peter, Aldakov Dmitry
Grupo de Pesquisa em Química de Materiais (GPQM), Departamento de Ciências Naturais, Universidade Federal de São João del-Rei, Campus Dom Bosco, Praça Dom Helvécio, 74, CEP 36301-160, São João del-Rei, MG, Brazil.
Univ. Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, STEP, 38000 Grenoble, France.
Nanomaterials (Basel). 2020 Jun 28;10(7):1252. doi: 10.3390/nano10071252.
A facile hydrothermal method to synthesize water-soluble copper indium sulfide (CIS) nanocrystals (NCs) at 150 °C is presented. The obtained samples exhibited three distinct photoluminescence peaks in the red, green and blue spectral regions, corresponding to three size fractions, which could be separated by means of size-selective precipitation. While the red and green emitting fractions consist of 4.5 and 2.5 nm CIS NCs, the blue fraction was identified as in situ formed carbon nanodots showing excitation wavelength dependent emission. When used as light absorbers in quantum dot sensitized solar cells, the individual green and red fractions yielded power conversion efficiencies of 2.9% and 2.6%, respectively. With the unfractionated samples, the efficiency values approaching 5% were obtained. This improvement was mainly due to a significantly enhanced photocurrent arising from complementary panchromatic absorption.
本文介绍了一种在150℃下合成水溶性硫化铜铟（CIS）纳米晶体（NCs）的简便水热法。所获得的样品在红色、绿色和蓝色光谱区域呈现出三个不同的光致发光峰，对应于三个尺寸部分，可通过尺寸选择性沉淀法分离。红色和绿色发光部分由4.5和2.5纳米的CIS NCs组成，而蓝色部分被鉴定为原位形成的碳纳米点，其发射表现出与激发波长相关。当用作量子点敏化太阳能电池中的光吸收剂时，单独的绿色和红色部分的功率转换效率分别为2.9%和2.6%。对于未分级的样品，获得了接近5%的效率值。这种提高主要归因于互补全色吸收导致的光电流显著增强。
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