摘要
研究了CuInS2(CIS)量子点敏化太阳能电池(QDSSCs)的电子注入和器件性能与粒子尺寸之间的依赖关系.首先合成了不同尺寸的CuInS2量子点(QDs),制备了CuInS2量子点敏化的TiO2薄膜,并组装了量子点敏化太阳能电池.通过循环伏安法确定了CuInS2量子点的能级位置.采用时间分辨荧光光谱分析测量了CuInS2量子点到TiO2薄膜的电子转移速率和效率.结果发现,随着粒子尺寸从4.0 nm减小到2.5 nm,电子注入速率略微增加而电子注入效率减小,同时量子点敏化太阳能电池的开路电压基本不变,而光电转换效率、短路电流和填充因子(FF)均减小.上述研究结果表明量子点敏化太阳能电池性能的优化可以通过改变量子点的尺寸来实现.
Size-dependent electron injection processes in CulnS2 （CIS） quantum dot sensitized solar cells （QDSSCs） were studied. CulnS2 quantum dots （QDs） with various diameters were synthesized and sensitized on TiO2 films. The energy levels of the CulnS2 QDs were measured by cyclic voltammetry. The rates and efficiencies of electron transfer from CulnS2 QDs to TiO2 films were determined by time-resolved photoluminescence spectroscopy. It was found that the rate of electron injection increased with a decrease in QD size while the e^ciency of electron injection decreased. Furthermore, the power conversion efficiency, the short-circuit photocurrent, and the fill factor （FF） of the QDSSCs increased with an increase in QD size. The enhanced performance of the QDSSCs was attributed to the increase in electron injection efficiency. These results indicate that the performance of the QDSSCs could be optimized by varying the size of the QDs.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第10期1861-1866,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(61405147
11274304
51375348)
浙江省教育厅科研项目(Y201430387)资助~~
关键词
量子点敏化太阳能电池
CulnS2量子点
电子转移
荧光寿命
时间分辨荧光光谱
Quantum dot sensitized solar cell
CulnS2 quantum dot
Electron transfer
Photoluminescence lifetime
Time-resolved photoluminescence spectroscopy
