School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, People's Republic of China.
Nanoscale Res Lett. 2013 Feb 11;8(1):67. doi: 10.1186/1556-276X-8-67.
Narrow bandgap PbS nanoparticles, which may expand the light absorption range to the near-infrared region, were deposited on TiO2 nanorod arrays by successive ionic layer adsorption and reaction method to make a photoanode for quantum dot-sensitized solar cells (QDSCs). The thicknesses of PbS nanoparticles were optimized to enhance the photovoltaic performance of PbS QDSCs. A uniform CdS layer was directly coated on previously grown PbS-TiO2 photoanode to protect the PbS from the chemical attack of polysulfide electrolytes. A remarkable short-circuit photocurrent density (approximately 10.4 mA/cm2) for PbS/CdS co-sensitized solar cell was recorded while the photocurrent density of only PbS-sensitized solar cells was lower than 3 mA/cm2. The power conversion efficiency of the PbS/CdS co-sensitized solar cell reached 1.3%, which was beyond the arithmetic addition of the efficiencies of single constituents (PbS and CdS). These results indicate that the synergistic combination of PbS with CdS may provide a stable and effective sensitizer for practical solar cell applications.
窄带隙 PbS 纳米颗粒可以将光吸收范围扩展到近红外区域，通过连续离子层吸附和反应方法将其沉积在 TiO2 纳米棒阵列上，制得量子点敏化太阳能电池 (QDSCs) 的光阳极。优化 PbS 纳米颗粒的厚度以提高 PbS QDSCs 的光伏性能。在先前生长的 PbS-TiO2 光阳极上直接涂覆均匀的 CdS 层，以保护 PbS 免受多硫化物电解质的化学攻击。PbS/CdS 共敏化太阳能电池记录到显著的短路光电流密度（约 10.4 mA/cm2），而 PbS 敏化太阳能电池的光电流密度低于 3 mA/cm2。PbS/CdS 共敏化太阳能电池的功率转换效率达到 1.3%，超过了单个组成部分（PbS 和 CdS）效率的算术加和。这些结果表明，PbS 与 CdS 的协同组合可能为实际太阳能电池应用提供稳定有效的敏化剂。
