Osorio Edith, Sánchez José G, Acquaroli Leandro N, Pacio Mauricio, Ferré-Borrull Josep, Pallarès Josep, Marsal Lluis F
Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain.
Department of Engineering Physics, Polytechnique Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Québec H3C 3A7, Canada.
ACS Omega. 2017 Jul 3;2(7):3091-3097. doi: 10.1021/acsomega.7b00534. eCollection 2017 Jul 31.
Inverted organic cells are promising devices for sustainable and low-cost future electric generation. In this work, we present the degradation mechanisms studied in ITO/TiO/PTB7:PCBM/VO/Ag inverted organic solar cells (iOSCs) by impedance spectroscopy (IS). Measurements were performed on encapsulated (controlled environment) and nonencapsulated (ambient condition) cells following their temporal evolution under AM1.5 illumination for several voltage biases. From the impedance spectra, analyzed in terms of resistive/capacitive equivalent circuits, we were able to identify that the most sensitive layers inside of the device are contact layers. According with presented, IS technique is useful for determining the materials that have more influence on the degradation of organic solar cells. We demonstrate that IS is a powerful technique to identify the limiting mechanisms and to establish the limiting materials inside of the iOSCs.
倒置有机电池是实现可持续和低成本未来发电的有前景的器件。在这项工作中，我们通过阻抗谱（IS）展示了在ITO/TiO/PTB7:PCBM/VO/Ag倒置有机太阳能电池（iOSCs）中研究的降解机制。在AM1.5光照下，对封装（可控环境）和未封装（环境条件）的电池在几个电压偏置下随时间的演变进行了测量。从根据电阻/电容等效电路分析的阻抗谱中，我们能够确定器件内部最敏感的层是接触层。根据所呈现的内容，IS技术对于确定对有机太阳能电池降解影响更大的材料很有用。我们证明IS是一种强大的技术，可用于识别iOSCs内部的限制机制并确定限制材料。
