Spontaneous phase separation of a zinc oxide interfacial layer in bulk heterojunction organic photovoltaics
Spontaneous phase separation of a zinc oxide interfacial layer in bulk heterojunction organic photovoltaics
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DOI：
10.1016/j.solmat.2014.11.031
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发表时间：
2015-03
影响因子：
6.9
通讯作者：
Yen-Sook Jung;Jun‐Seok Yeo;Byung-Kwan Yu;Dong‐Yu Kim
中科院分区：
文献类型：
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作者：
Yen-Sook Jung;Jun‐Seok Yeo;Byung-Kwan Yu;Dong‐Yu Kim
以氧化锌溶胶-凝胶混合溶液为界面材料，P3HT：PCBM(poly(3-hexylthiophene)：[6，6]-phenyl-C61-butyric甲酯为光活性组分，通过简单的一步法制备了界面层和有源层。基于一步法工艺得到的器件在简单的紫外光处理后表现出良好的3.56%的功率转换效率(PCE)，接近传统制造的具有多层结构的参考器件的PCE。结合表面形貌分析和垂直成分分布的研究，我们证实了在旋涂和随后的热退火过程中，ZnO和光活性材料之间发生了自发的和显著的相分离。这导致在ITO表面自动形成丰富的氧化锌界面层。用一步法在ITO衬底上沉积的氧化锌层的功函数为3.76 eV，与传统形成的氧化锌层的功函数一致。此外，一步法制备的器件在光照下表现出了良好的稳定性。这种使用一步法工艺的有机光伏(OPV)的成功演示是朝着实现高性能、卷对卷兼容OPV迈出的重要一步。
An interfacial layer and active layer were simultaneously fabricated through a facile one-step process using a blended solution of zinc oxide (ZnO) sol-gel as the interfacial material, and P3HT:PCBM (poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric methyl ester) as the photoactive components. The resultant devices based on the one-step process exhibited a favourable 3.56% power conversion efficiency (PCE) after a simple UV light treatment, close to the PCE of a conventionally fabricated reference device with a multilayer architecture. Using a combination of surface morphology analysis and investigation of the vertical component distribution, we confirmed that a spontaneous and significant phase separation between the ZnO and the photoactive materials occurred during the spin coating and sequential thermal annealing processes. This resulted in the automatic formation of an enriched ZnO interfacial layer at the ITO surface. The work function of the ZnO layer deposited by the one-step process on the ITO substrate was 3.76 eV, consistent with conventionally formed ZnO layers. Furthermore, the performance of the device fabricated by the one-step process demonstrated superior stability under light exposure. This successful demonstration of organic photovoltaics (OPVs) using the one-step process is an important step towards the realization of high performance, roll-to-roll compatible OPVs.