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首页> 美国卫生研究院文献>Scientific Reports >Hybrid Organic Tandem Solar Cell Comprising Small-Molecule Bottom and Polymer:Fullerene Top Subcells Fabricated by Thin-Film Transfer
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Hybrid Organic Tandem Solar Cell Comprising Small-Molecule Bottom and Polymer:Fullerene Top Subcells Fabricated by Thin-Film Transfer

机译：混合有机串联太阳能电池包含小分子底部和聚合物：通过薄膜转移制造的富勒烯顶部子电池

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Multilayer structures involving solution-deposited polymer films are difficult to fabricate, not allowing for unrestricted designs of polymer-based optoelectronic devices required for maximizing their performance. Here, we fabricate a hybrid organic tandem solar cell whose top and bottom subcells have polymer:fullerene and small molecules active layers, respectively, by a solvent-free process based on transferring the polymer:fullerene layer from an elastomeric stamp onto a vacuum-deposited bottom subcell. The interface between small-molecule and transferred polymer:fullerene layers is void-free at the nanoscale, allowing for efficient charge transport across the interface. Consequently, the transfer-fabricated tandem cell has an open-circuit voltage (V OC) almost identical to the sum of V OC values for the single-junction devices. The short-circuit current density (J SC) of the tandem cell is maximized by current matching achieved by varying the thickness of the small-molecule active layer in the bottom subcell, which is verified by numerical simulations. The optimized transfer-fabricated tandem cell, whose active layers are composed of poly[2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl]]:[6,6]-Phenyl-C71-butyric acid methyl ester and Di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane:C70, has V OC = 1.46 V, J SC = 8.48 mA/cm2, a fill factor of 0.51, leading to the power-conversion efficiency of 6.26%, the highest among small molecule–polymer:fullerene hybrid tandem solar cells demonstrated so far.
机译：涉及溶液沉积的聚合物膜的多层结构难以制造，这不允许最大化其性能所需的基于聚合物的光电器件的无限制设计。在这里，我们通过将聚合物：富勒烯层从弹性体模版转移到真空沉积的无溶剂工艺，制造出其顶部和底部子电池分别具有聚合物：富勒烯和小分子活性层的混合有机串联太阳能电池。底部子单元。小分子和转移的聚合物：富勒烯层之间的界面在纳米尺度上是无空隙的，从而可以实现跨界面的有效电荷传输。因此，转移制造的串联电池具有几乎与单结器件的V OC值之和相等的开路电压（V OC）。串联电池的短路电流密度（J SC）通过改变底部子电池中小分子活性层的厚度而实现的电流匹配得以最大化，这已通过数值模拟得到了验证。优化的转移制造串联电池，其活性层由聚[2,1,3-苯并噻二唑-4,7-二基[4,4-双（2-乙基己基）-4H-环戊[2,1-b]组成：3,4-b']二噻吩-2,6-diyl]]：[6,6]-苯基-C71-丁酸甲酯和二-[4-（N，N-二-对甲苯基-氨基）-苯基]环己烷：C70，V OC = 1.46 V，J SC = 8.48 mA / cm 2 ，填充系数为0.51，导致功率转换效率最高为6.26％到目前为止，在小分子聚合物：富勒烯混合串联太阳能电池中的应用已经得到证明。

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