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The effect of polymer optoelectronic properties on the performance of multilayer hybrid polymer/TiO2 solar cells

机译：聚合物光电性能对多层杂化聚合物/ TiO2太阳能电池性能的影响

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摘要

We report a study of the effects of polymer optoelectronic properties on the performance of photovoltaic devices consisting of nanocrystalline TiO2 and a conjugated polymer. Three different poly(2-methoxy-5-(2'-ethylhexoxy)-1,4-phenylenevinylene) (MEH-PPV)-based polymers and a fluorene-bithiophene copolymer are compared. We use photoluminescence quenching, time-of-flight mobility measurements, and optical spectroscopy to characterize the exciton-transport, charge-tran sport, and light-harvesting properties, respectively, of the polymers, and correlate these material properties with photovoltaic-device performance. We find that photocurrent is primarily limited by the photogeneration rate and by the quality of the interfaces, rather than by hole transport in the polymer. We have also studied the photovoltaic performance of these TiO2/polymer devices as a function of the fabrication route and device design. Including a dip-coating step before spin-coating the polymer leads to excellent polymer penetration into highly structured TiO2 networks, as was confirmed through transient optical measurements of the photoinduced charge-transfer yield and recombination kinetics. Device performance is further improved for all material combinations studied, by introducing a layer of poly(ethylene dioxythiophene) (PEDOT) doped with poly(styrene sulfonic acid) (PSS) under the top contact. Optimized devices incorporating the additional dip-coated and PEDOTYSS layers produced a short-circuit current density of about 1. mA cm(-2), a fill factor of 0.50, and an open-circuit voltage of 0.86 V under simulated AM 1.5 illumination (100 mW cm(-2), 1 sun). The corresponding power conversion efficiency under 1 sun was >= 0.4 %.
机译：我们报告了对由纳米晶TiO2和共轭聚合物组成的光伏器件性能对聚合物光电性能影响的研究。比较了三种不同的聚（2-甲氧基-5-（2'-乙基己氧基）-1,4-亚苯基亚乙烯基）（MEH-PPV）基聚合物和芴-联噻吩共聚物。我们分别使用光致发光猝灭，飞行时间迁移率测量和光谱学来表征聚合物的激子传输，电荷传输运动和光收集特性，并将这些材料特性与光伏器件性能相关联。我们发现光电流主要受光生速率和界面质量的限制，而不是受聚合物中空穴传输的限制。我们还研究了这些TiO2 /聚合物器件的光电性能与制造路线和器件设计的关系。如通过瞬态光学测量光诱导的电荷转移产率和复合动力学所证实的那样，在旋涂聚合物之前包括浸涂步骤可导致极好的聚合物渗透到高度结构化的TiO2网络中。通过在顶部触点下方引入一层掺杂有聚（苯乙烯磺酸）（PSS）的聚（乙撑二氧噻吩）（PEDOT）层，可以进一步改善所研究的所有材料组合的器件性能。经过优化的器件结合了额外的浸涂和PEDOTYSS层，在模拟的AM 1.5光照下产生的短路电流密度约为1. mA cm（-2），填充系数为0.50，开路电压为0.86 V（ 100 mW cm（-2），1个太阳）。 1个太阳下的相应功率转换效率> = 0.4％。

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