S Anjusree, K R Arya, Das Bikas C
Emerging Nanoelectronic Devices Research Laboratory (eNDR Lab), School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM) Maruthamala PO, Vithura Thiruvananthapuram 695551 Kerala India
RSC Adv. 2020 Jul 1;10(42):24882-24892. doi: 10.1039/d0ra03986a. eCollection 2020 Jun 29.
Atmospheric processing of organic solar cells (OSCs) has already emerged and will be a challenge to emulate with the existing market leaders in terms of overall cost reduction and large scale production. However, the presence of defects in the active layer of OSC needs to be identified effectively to minimize the performance degradation involved. In this work, conventional bulk-heterojunction (BHJ) OSCs are fabricated entirely in air having an efficiency () up to 4.0% using P3HT and PCBM as the donor and acceptor, respectively. The devices have exhibited reasonable degradation of performance parameters with aging time and uninterrupted illumination during characterization in ambient air. This visible degradation was as expected because of environmental oxygen and moisture penetration into the photoactive layer through the defects, which can be prevented by immediate encapsulation. Conducting AFM is utilized here to visualize these defects more prominently, which are impossible to see in typical AFM topography. Overall, significant development of atmospheric processing of BHJ OSCs is made, and performance stability is also studied to bring down the fabrication costs in the near future.
有机太阳能电池（OSC）的大气处理技术已经出现，并且在降低总体成本和大规模生产方面，将对现有市场领导者构成挑战。然而，需要有效识别OSC活性层中的缺陷，以尽量减少由此导致的性能下降。在这项工作中，分别使用P3HT和PCBM作为供体和受体，在空气中完全制备了传统的体异质结（BHJ）OSC，其效率（）高达4.0%。在环境空气中进行表征时，这些器件的性能参数随老化时间和持续光照呈现出合理的下降。由于环境中的氧气和水分通过缺陷渗透到光活性层中，这种明显的性能下降在意料之中，而通过立即封装可以防止这种情况发生。这里利用导电原子力显微镜（AFM）更清晰地观察这些缺陷，这些缺陷在典型的AFM形貌中是看不到的。总体而言，BHJ OSC的大气处理技术取得了重大进展，同时也对性能稳定性进行了研究，以便在不久的将来降低制造成本。
