Wuhan National Laboratory for Optoelectronics, and School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, China.
Research Institute of Huazhong University of Science and Technology in Shenzhen , Shenzhen 518057, China.
ACS Appl Mater Interfaces. 2017 Jul 19;9(28):24027-24034. doi: 10.1021/acsami.7b05380. Epub 2017 Jul 7.
Both single-junction and tandem organic photovoltaic cells have been well developed. A tandem cell contains two junctions with a charge recombination layer (CRL) inserted between the two junctions. So far, there is no detailed report on how the device will perform that contains two junctions but without a CRL in between. In this work, we report the photocurrent spectra and photovoltage output of the devices that contains two bulk-heterojunctions (BHJ) stacked directly on top of each other without a CRL. The top active layer is prepared by transfer printing. The photocurrent response spectra and photovoltage are found to be sensitive to stacking sequence and the selection of electron acceptors. The open-circuit voltage of the devices (up to 1.09 V) can be higher than the devices containing either junction layer. The new phenomenon in the new device architecture increases the versatility of the optoelectronic devices based on organic semiconductors.
单结和串联有机光伏电池都得到了很好的发展。串联电池包含两个结，并在两个结之间插入一个电荷复合层（CRL）。到目前为止，还没有详细的报告说明在没有 CRL 的情况下，包含两个结的器件将如何工作。在这项工作中，我们报告了包含两个本体异质结（BHJ）的器件的光电流光谱和光伏电压输出，这些 BHJ 直接堆叠在一起，中间没有 CRL。顶部活性层通过转印制备。发现光电流响应光谱和光电压对堆叠顺序和电子受体的选择敏感。器件的开路电压（高达 1.09 V）可以高于包含任何结层的器件。在新的器件结构中出现的新现象增加了基于有机半导体的光电设备的多功能性。
