摘要
利用氧化锌溶胶-凝胶(Sol-Gel)、锌盐乙醇溶液(ES)和氧化锌纳米粒子溶液(NP)三种不同的籽晶层前驱液,在ITO衬底上通过化学浴沉积方法(CBD)制备出了一维氧化锌纳米棒阵列薄膜,并在所制备的氧化锌纳米棒阵列薄膜上构筑了具有"三维"异质结结构的PbS量子点太阳能电池。通过扫描电镜(SEM)、X射线衍射(XRD)和透射光谱分析等研究了籽晶层对氧化锌纳米棒阵列薄膜形貌、结构和光学性质的影响;结合电池性能测试结果,比较分析了"三维"异质结结构和"平面"异质结结构对电池性能的影响。结果表明:在ES籽晶层上生长的氧化锌纳米棒阵列薄膜的取向性最好,Sol-Gel次之,NP最差;在ES和Sol-Gel籽晶层上生长2 h的样品透射率在80%左右;与"平面"异质结结构PbS量子点电池相比,基于氧化锌纳米棒阵列薄膜制备的"三维"异质结结构电池的短路电流可提高40%,表明"三维"异质结结构有利于载流子的分离和输运。
ZnO sol-gel（ Sol-Gel）,zinc salt ethanol solution（ ES） and ZnO nanoparticle solution（ NP）were used as precursors to grow seed layers on ITO substrates. One-dimensional ZnO nanorod arrays were synthesized by chemical bath deposition method（ CBD） on the ITO substrates. Three-dimensional（ 3D）heterojunction Pb S quantum dot solar cells were fabricated with ZnO nanorod arrays grown on sol-gel seed layer. Scanning electron microscopy,X-ray diffraction and transmission spectroscopy were employed to analyze effect of seed layers on the morphologies,structure and optical properties of Zn O nanorod arrays.The performance of solar cells with 3D heterojunctions was compared with that of planar heterojunctionsolar cells. The results show that ZnO nanorods grown on ES and NP seed layers are well-aligned and free-standing,respectively,and the orientation of those grown on Sol-Gel seed layer is medium. The transmittance of ZnO nanorod arrays grown on ES and Sol-Gel seed layers for 2 hours is around 80%,favoring the fabrication of solar cells. Compared to Pb S quantum dot photovoltaic devices with planar heterojunctions,the short-circuit current density of 3D heterojunction quantum dot solar cells based on ZnO nanorod arrays was improved by 40%,indicating that 3D heterojunction structure facilitates the dissociation and transportation of carriers.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第6期1509-1515,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(21471111
61475110)
江苏省太阳能电池材料与技术重点实验室开放课题(201205)
电子薄膜与集成器件国家重点实验室开放课题(KFJJ201406)
山西省科技创新重点团队(2012041011)
山西省青年科技研究项目基金(2014021019-1)
