Li Huazheng, Lu Wangwei, Song Bin, Zhou Jing, Zhao Gaoling, Han Gaorong
State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University Hangzhou 310027 P. R. China
State Key Laboratory of Silicon Materials & Department of Physics, Zhejiang University Hangzhou 310027 P. R. China.
RSC Adv. 2020 Sep 29;10(59):35701-35708. doi: 10.1039/d0ra06381a. eCollection 2020 Sep 28.
High quality Mn-doped CdTe quantum dots (QDs), Co-doped CdTe QDs and Mn&Co co-doped CdTe QDs were successfully synthesized an aqueous phase method with mercaptopropanoic acid (MPA) ligands. The doped QDs maintain the same zinc blende structure of CdTe by X-ray diffraction (XRD). The Mn-doped CdTe QDs and Co-doped CdTe QDs both show a red-shift on absorption and photoluminescence (PL) spectra compared to pure CdTe QDs. In addition, Mn-doped CdTe QDs show a significant increase in the PL lifetime due to an orbitally forbidden d-d transition, which is of benefit to the reduction of electron recombination loss. Co doping has a more matched doping energy level. In view of this, Mn&Co co-doped CdTe QDs were applied as sensitizers for quantum dot sensitized solar cells, resulting in a significantly enhanced efficiency.
采用水相法，以巯基丙酸（MPA）为配体，成功合成了高质量的锰掺杂碲化镉量子点（QDs）、钴掺杂碲化镉量子点以及锰和钴共掺杂碲化镉量子点。通过X射线衍射（XRD）可知，掺杂后的量子点保持了与碲化镉相同的闪锌矿结构。与纯碲化镉量子点相比，锰掺杂碲化镉量子点和钴掺杂碲化镉量子点的吸收光谱和光致发光（PL）光谱均出现红移。此外，由于轨道禁戒的d-d跃迁，锰掺杂碲化镉量子点的PL寿命显著增加，这有利于减少电子复合损失。钴掺杂具有更匹配的掺杂能级。鉴于此，锰和钴共掺杂碲化镉量子点被用作量子点敏化太阳能电池的敏化剂，从而显著提高了效率。
