Caballero Raquel, Haass Stefan G, Andres Christian, Arques Laia, Oliva Florian, Izquierdo-Roca Victor, Romanyuk Yaroslav E
Departamento de Física Aplicada, Universidad Autónoma de Madrid, Madrid, Spain.
Laboratory for Thin Films and Photovoltaics, Empa- Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.
Front Chem. 2018 Jan 26;6:5. doi: 10.3389/fchem.2018.00005. eCollection 2018.
The introduction of the alkaline-earth element Magnesium (Mg) into CuZnSn(S,Se) (CTZSSe) is explored in view of potential photovoltaic applications. CuZnMgSn(S,Se) absorber layers with variable Mg content = 0…1 are deposited using the solution approach with dimethyl sulfoxide solvent followed by annealing in selenium atmosphere. For heavy Mg alloying with = 0.55…1 the phase separation into CuSnSe, MgSe, MgSe and SnSe occurs in agreement with literature predictions. A lower Mg content of = 0.04 results in the kesterite phase as confirmed by XRD and Raman spectroscopy. A photoluminescence maximum is red-shifted by 0.02 eV as compared to the band-gap and a carrier concentration N of 1 × 10 cm is measured for a Mg-containing kesterite solar cell device. Raman spectroscopy indicates that structural defects can be reduced in Mg-containing absorbers as compared to the Mg-free reference samples, however the best device efficiency of 7.2% for a Mg-containing cell measured in this study is lower than those frequently reported for the conventional Na doping.
鉴于潜在的光伏应用，对将碱土元素镁（Mg）引入铜锌锡（硫，硒）（CTZSSe）进行了探索。使用二甲基亚砜溶剂通过溶液法沉积镁含量可变（x = 0…1）的铜锌镁锡（硫，硒）吸收层，随后在硒气氛中退火。对于重镁合金化（x = 0.55…1），会发生相分离形成CuSnSe、MgSe、MgSe和SnSe，这与文献预测一致。较低的镁含量（x = 0.04）会形成方铅矿相，这通过X射线衍射（XRD）和拉曼光谱得到证实。与带隙相比，光致发光最大值红移了0.02电子伏特，并且对于含镁方铅矿太阳能电池器件，测量到载流子浓度N为1×10¹⁵厘米⁻³。拉曼光谱表明，与不含镁的参考样品相比，含镁吸收体中的结构缺陷可以减少，然而，在本研究中测量的含镁电池的最佳器件效率为7.2%，低于常规钠掺杂经常报道的效率。
