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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Effect of nanocrystalline-TiO2 morphology on the performance of polymer heterojunction solar cells
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Effect of nanocrystalline-TiO2 morphology on the performance of polymer heterojunction solar cells

机译：纳米TiO2形态对聚合物异质结太阳能电池性能的影响

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摘要

We compare the performance of ruthenium-dye-sensitized, heterojunction solar cells formed from the p-type organic semiconductor poly (3-hexylthiophene), P3HT, and sintered nanocrystalline-titanium dioxide ( nc-TiO2) films prepared from different batches of sol-gel material. Atomic force microscopy shows that the RMS roughness of the nc-TiO2 layers from these different batches ranged from 12.7 to 20.5 nm with the corresponding mean particle height ranging from 60 to 90 nm. Scanning electron microscopy reveals that these different topographies are linked to differences in the morphology of the sintered nc-TiO2 layers. Thermogravimetric analysis suggests that these structural differences may arise from differences in the solvent concentration in the nominally identical sol-gel solutions used for preparing the nc-TiO2 layer. The best solar cell performance, achieved with films showing the highest RMS roughness and a 'columnar' morphology, displayed the highest external quantum efficiencies (EQEs) reported for this combination of materials: 11%< EQE < 16% for the wavelength range 580-380 nm. However, the lower turn-on voltage for the dark, forward current in these devices leads to a reduction of similar to 0.2V in open-circuit voltage compared with the smoother films of nc-TiO2.
机译：我们比较了由p型有机半导体聚（3-己基噻吩），P3HT和由不同批次的溶胶-溶胶制备的烧结纳米晶体二氧化钛（nc-TiO2）膜形成的钌染料敏化的异质结太阳能电池的性能。凝胶材料。原子力显微镜显示，来自这些不同批次的nc-TiO2层的RMS粗糙度范围为12.7至20.5 nm，相应的平均颗粒高度范围为60至90 nm。扫描电子显微镜揭示这些不同的形貌与烧结的nc-TiO 2层的形态差异有关。热重分析表明，这些结构差异可能源于用于制备nc-TiO2层的名义上相同的溶胶-凝胶溶液中溶剂浓度的差异。用具有最高RMS粗糙度和“柱状”形态的薄膜获得的最佳太阳能电池性能，显示出这种材料组合的最高外部量子效率（EQE）：在580-波长范围内，其11％

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