Solar cells using iodine-doped polythiophene–porphyrin polymer films
Solar cells using iodine-doped polythiophene–porphyrin polymer films
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DOI：
10.1016/j.solmat.2005.08.010
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发表时间：
2006-05
影响因子：
6.9
通讯作者：
K. Takechi;T. Shiga;T. Motohiro;T. Akiyama;S. Yamada;H. Nakayama;K. Kohama
中科院分区：
文献类型：
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作者：
K. Takechi;T. Shiga;T. Motohiro;T. Akiyama;S. Yamada;H. Nakayama;K. Kohama
制备了含5，10，15，20-3-四硫基卟啉(TThP)和聚噻吩膜(PTH)的湿式有机太阳能电池。在n-Bu4NPF6/CH2Cl2溶液中，采用电化学聚合的方法在ITO玻璃上制备了TThP/PTH薄膜。研究发现，少量的碘掺杂提高了由TThP/PTH薄膜和水电解液组成的太阳电池的入射光电子转换效率。HOMO能级测量表明，低碘掺杂的TThP/PTH薄膜的HOMO能级允许电子从PTH快速转移到卟啉部分。为了获得进一步的改进，我们用含0.05M碘和0.5M碘化锂的5%(w/w)乙腈水溶液作为电解液，制备了夹心型太阳电池。该太阳能电池在300-800 nm波长范围内吸收光，并在430 nm处转换为阴极光电流，在5.0×10~(14)光子cm−_2S−_1的照射下，最大IPCE为32%。这一值比使用水电解液的太阳电池高约10倍。太阳电池在模拟阳光下的总能量转换效率(η)分别为2.59 mWcm−2at AM1.5和100 mW cm−2at空气质量1.5at时的0.12%和0.05%。
Wet-type organic solar cells containing 5,10,15,20-3-tetrathienylporphyrin (TThP) and polythiophene (PTh) films were fabricated. The TThP/PTh film was prepared on indium-tin-oxide (ITO) glass using an electrochemical polymerization method in an n-Bu4NPF6/CH2Cl2solution. It was found that a small amount of iodine doping of the film improved the incident photon-to-electron conversion efficiency (IPCE) of a solar cell consisting of a TThP/PTh film and an aqueous electrolyte. A HOMO level measurement suggested that a modified HOMO level of the low iodine-doped TThP/PTh film allowed a fast electron transfer from PTh to a porphyrin moiety. To obtain further improvement, a sandwich-type solar cell using a 5% (w/w) aqueous solution of acetonitrile containing 0.05M iodine and 0.5M lithium iodide as an electrolyte was then fabricated. The solar cell absorbed light in the 300–800nm wavelength range, converting this to a cathodic photocurrent with a maximum IPCE of 32% at 430nm under irradiation of 5.0×1014photoncm−2s−1. This value is about 10 times higher than that of the solar cells using an aqueous electrolyte. The total energy conversion efficiency (η) of the solar cell under simulated sunlight reached 0.12% for 2.59mWcm−2at AM1.5 and 0.05% for 100mWcm−2at air mass 1.5.