Akin Kara Duygu, Burnett Edmund K, Kara Koray, Usluer Ozlem, Cherniawski Benjamin P, Barron Edward J, Gultekin Burak, Kus Mahmut, Briseno Alejandro L
Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA, 01003, USA.
Solar Energy Institute, Ege University, 35000, Izmir, Turkey.
Phys Chem Chem Phys. 2022 May 11;24(18):10869-10876. doi: 10.1039/d2cp00985d.
Single crystal studies provide a better understanding of the basic properties of organic photovoltaic devices. Therefore, in this work, rubrene single crystals with a thickness of 250 nm to 1000 nm were used to produce an inverted bilayer organic solar cell. Subsequently, polycrystalline rubrene (orthorhombic, triclinic) and amorphous bilayer solar cells of the same thickness as single crystals were studied to make comparisons across platforms. To investigate how single crystal, polycrystalline (triclinic-orthorhombic) and amorphous forms alter the charge carrier recombination mechanism at the rubrene/PCBM interface, light intensity measurements were carried out. The light intensity dependency of the , and parameters in organic solar cells with different forms of rubrene was determined. Monomolecular (Shockley Read Hall) recombination is observed in devices employing amorphous and polycrystalline rubrene in addition to bimolecular recombination, whereas the single crystal device is weakly affected by trap assisted SRH recombination due to reduced trap states at the donor acceptor interface. To date, the proposed work is the only systematic study examining transport and interface recombination mechanisms in organic solar cells produced by different structure forms of rubrene.
单晶研究有助于更好地理解有机光伏器件的基本特性。因此，在本工作中，使用厚度为250纳米至1000纳米的红荧烯单晶来制备倒置双层有机太阳能电池。随后，研究了与单晶厚度相同的多晶红荧烯（正交晶系、三斜晶系）和非晶双层太阳能电池，以便在不同平台之间进行比较。为了研究单晶、多晶（三斜晶系 - 正交晶系）和非晶形式如何改变红荧烯/聚碳酸亚乙烯酯（PCBM）界面处的电荷载流子复合机制，进行了光强测量。确定了具有不同形式红荧烯的有机太阳能电池中、和参数对光强的依赖性。除了双分子复合外，在采用非晶和多晶红荧烯的器件中还观察到单分子（肖克利 - 里德 - 霍尔）复合，而单晶器件由于供体 - 受体界面处陷阱态的减少，受陷阱辅助的肖克利 - 里德 - 霍尔复合的影响较弱。迄今为止，所提出的这项工作是唯一一项系统研究，考察了由不同结构形式的红荧烯制备的有机太阳能电池中的传输和界面复合机制。
