Organic solar cells pros and cons: Outlooks toward semitransparent cell efficiency and stability

Abstract

Organic solar cells (OSCs) are promising for low emissive photovoltaic technology. Excitonic absorption and charge generation to transport process OSC energy loss lessening are central. In this context, donor–acceptor barrier offset, related binding, and thermal effect on energy loss are the key challenge. Semitransparent organic solar cell visible band transmission and near infrared band absorption are anticipated. Near infrared band absorption in a Si material solar cell is higher that supports more energy conversion. Moreover, greater carrier selectivity and open circuit voltage (Voc) is incredible to increase the energy efficiency. OSC utmost absorption but carrier generation and charge transfer state donor–acceptor barrier offset increases carrier recombination loss. Upon analysis of small molecule donors and polymers along with non-fullerene and previously studied fullerene acceptors, it is realized that active material morphology, thickness, and interface design are impending to overcome the energy loss. For efficiency–transparency trade-off as well as stability problem lessening purpose thin active materials and interface, their absorption band tenability and carrier selectivity are main requisites. In this scope, very thin non-fullerene acceptors in ternary blend heterostructures and innovative-transparent hole transport layers can play a vital role. Therefore, recombination loss lessening and transparency purpose near infrared band absorbent thin active layer ternary blend and transparent electrodes of a thin hetero-interface predominant field effect over the thermal effect are reported in the efficiency and stability scope.