Low-Temperature Solution-Processed Solar Cells Based on PbS Colloidal Quantum Dot/CdS Heterojunctions
Low-Temperature Solution-Processed Solar Cells Based on PbS Colloidal Quantum Dot/CdS Heterojunctions
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DOI：
10.1021/nl3041417
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发表时间：
2013-03-01
期刊：
影响因子：
10.8
通讯作者：
Bawendi, Moungi G.
中科院分区：
文献类型：
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作者：
Chang, Liang-Yi;Lunt, Richard R.;Bawendi, Moungi G.
PbS 胶体量子点异质结太阳能电池在性能方面已显示出显着改进，主要基于使用高温退火过渡金属氧化物与量子点薄膜创建整流结的设备。在这里，我们展示了一种基于 PbS 胶体量子点层和 CdS 薄膜之间形成的异质结的太阳能电池，这些薄膜通过 80 摄氏度的溶液工艺沉积。所得器件采用 1,2-乙二硫醇配体交换方案，平均功率转换效率为 3.5%。通过结合厚度相关的电流密度-电压特性、光学建模和电容测量，发现 PbS 量子点层中的组合扩散长度和耗尽宽度约为 170 nm。
PbS colloidal quantum dot heterojunction solar cells have shown significant improvements in performance, mostly based on devices that use high-temperature annealed transition metal oxides to create rectifying junctions with quantum dot thin films. Here, we demonstrate a solar cell based on the heterojunction formed between PbS colloidal quantum dot layers and CdS thin films that are deposited via a solution process at 80 degrees C. The resultant device, employing a 1,2-ethanedithiol ligand exchange scheme, exhibits an average power conversion efficiency of 3.5%. Through a combination of thickness-dependent current density-voltage characteristics, optical modeling, and capacitance measurements, the combined diffusion length and depletion width in the PbS quantum dot layer is found to be approximately 170 nm.