Lim Sungoh, Kim Yohan, Lee Jeongno, Han Chul Jong, Kang Jungwon, Kim Jiwan
J Nanosci Nanotechnol. 2014 Dec;14(12):9346-50. doi: 10.1166/jnn.2014.10138.
Colloidal quantum dots (QD)-based solar cells with near infrared (NIR) emission have been investigated. Lead sulfide (PbS) QDs, which have narrow band-gap and maximize the absorption of NIR spectrum, were chosen as active materials for efficient solar cells. The inverted structure of indium tin oxide/titanium dioxide/PbS QDs/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)/silver (ITO/TiO2/PbS QDs/
PSS/Ag) was applied for favorable electron and hole seperation from the PbS QD. Through the ligand exchange by 1,2-Ethanedithiol (EDT), the interparticle distance of the PbS QDs in thin film became closer and the performance of the PbS QD-based solar cells was improved. Our PbS QD-based inverted solar cells showed open circuit voltages (V(oc)) of 0.33 V, short circuit current density (J(sc)) of 10.89 mA/cm2, fill factor (FF) of 30%, and power conversion efficiency (PCE) of 1.11%. In our PbS QD-based multifunctional solar cell, the NIR light emission intensity was simply detected with photodiode system, which implies the potential of multi-functional diode device for various applications.
已对具有近红外（NIR）发射的基于胶体量子点（QD）的太阳能电池进行了研究。硫化铅（PbS）量子点具有窄带隙且能使近红外光谱的吸收最大化，被选为高效太阳能电池的活性材料。采用氧化铟锡/二氧化钛/硫化铅量子点/聚（3,4 - 乙撑二氧噻吩） - 聚（苯乙烯磺酸盐）/银（ITO/TiO₂/PbS量子点/PEDOT:PSS/Ag）的倒置结构，以利于从硫化铅量子点中分离电子和空穴。通过1,2 - 乙二硫醇（EDT）进行配体交换，薄膜中硫化铅量子点的粒子间距离变近，基于硫化铅量子点的太阳能电池性能得到改善。我们基于硫化铅量子点的倒置太阳能电池的开路电压（V(oc)）为0.33 V，短路电流密度（J(sc)）为10.89 mA/cm²，填充因子（FF）为30%，功率转换效率（PCE）为1.11%。在我们基于硫化铅量子点的多功能太阳能电池中，利用光电二极管系统可简单检测近红外光发射强度，这意味着多功能二极管器件在各种应用中的潜力。
