Efficient electron transport in tetrapod-like ZnO metal-free dye-sensitized solar cells
Efficient electron transport in tetrapod-like ZnO metal-free dye-sensitized solar cells
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DOI：
10.1039/b902595m
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发表时间：
2009-06
影响因子：
32.5
通讯作者：
W. Chiu;Chia-Hua Lee;Hsin-Ming Cheng;Hsiu-Fen Lin;S. Liao;Jenn‐Ming Wu;W. Hsieh
中科院分区：
文献类型：
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作者：
W. Chiu;Chia-Hua Lee;Hsin-Ming Cheng;Hsiu-Fen Lin;S. Liao;Jenn‐Ming Wu;W. Hsieh
采用四针状纳米氧化锌作为染料敏化太阳能电池的光阳极，构建了高效的电子传输网络。由于不含金属的D149染料具有很高的消光系数，在氧化锌网络中提供了高的光电流，基于42微米的四脚状氧化锌薄膜的DSCs的最佳性能显示出高的能量转换效率为4.9%，高的短路光电流密度为12.3 mA cm−2，开路光电压为0.6V，在AM 1.5照射下的填充因子为0.65。高效的电子传输也可以归因于由电化学阻抗谱确定的长的有效电子扩散长度为46微米，这与JSC测量的厚度相关。
The tetrapod-like ZnO nanopowders are employed to construct an efficient electron transport network as the photoanode of the dye-sensitized solar cells (DSCs). Due to the high extinction coefficient of the metal-free D149 dye offering a high photocurrent through the ZnO network, the best performance of DSCs based on a 42 µm terapod-like ZnO film showed a high energy conversion efficiency of 4.9% with a high short-circuit photocurrent density of 12.3 mA cm−2, an open-circuit photovoltage of 0.6 V, and a fill factor of 0.65 under AM 1.5 irradiation. Highly efficient electron transport may also be ascribed by a long effective electron diffusion length of 46 µm determined from the electrochemical impedance spectroscopy which is consistent with thickness dependent JSC measurements.