Oligothiophene Interlayer Effect on Photocurrent Generation for Hybrid TiO2/P3HT Solar Cells
Oligothiophene Interlayer Effect on Photocurrent Generation for Hybrid TiO2/P3HT Solar Cells
复制标题
DOI：
10.1021/am5050532
复制
发表时间：
2014-10-08
影响因子：
9.5
通讯作者：
Robertson, Neil
中科院分区：
文献类型：
--
作者：
Planells, Miguel;Abate, Antonio;Robertson, Neil
合成了一系列共轭长度为1 ~ 5个噻吩单元（1 T ~ 5 T）的3-己基噻吩衍生物。UV-vis光谱、光致发光光谱、电化学数据和密度泛函理论计算表明，随着噻吩链长的增加，其LUMO能量降低，吸收峰向可见光红移。通过1 T-5 T对TiO 2表面进行预先官能化来制备TiO 2/P3 HT太阳能电池，并且研究包括使用未掺杂的P3 HT和使用掺杂有H-TFSI的P3 HT的电池。在没有H-TFSI掺杂的情况下，从低聚噻吩和P3 HT两者发生光电流产生。用H-TFSI掺杂P3 HT淬灭了由P3 HT的激发产生的光电流，但在激发低聚噻吩时能够实现非常有效的电荷提取。在这种情况下，光电流产生随着1 T-5 T的光捕获能力而增加，导致使用5 T的2.32%的最高效率。总体而言，我们已经表明，P3 HT可以在电荷产生或电荷收集中起作用，但不能同时有效地执行这两种功能，这说明了进一步开发TiO 2/P3 HT太阳能电池的核心挑战。
A series of conjugated 3-hexylthiophene derivatives with a cyanoacrylic acid group has been prepared with conjugation length from one up to five thiophene units (1T-5T). The UV-vis spectra, photoluminescence spectra, electrochemical data and DFT calculations show lowering of LUMO energies and red-shift of absorption into the visible as the thiophene chain length increases. TiO2/P3HT solar cells were prepared with prior functionalization of the TiO2 surface by 1T-5T and studies include cells using undoped P3HT and using P3HT doped with H-TFSI. Without H-TFSI doping, photocurrent generation occurs from both the oligothiophene and P3HT. Doping the P3HT with H-TFSI quenches photocurrent generation from excitation of P3HT, but enables very effective charge extraction upon excitation of the oligothiophene. In this case, photocurrent generation increases with the light harvesting ability of 1T-5T leading to a highest efficiency of 2.32% using 5T. Overall, we have shown that P3HT can act in either charge generation or in charge collection, but does not effectively perform both functions simultaneously, and this illustrates a central challenge in the further development of TiO2/P3HT solar cells.