Enhanced and Balanced Charge Transport Boosting Ternary Solar Cells Over 17% Efficiency

Danqin Li, Lei Zhu, Xianjie Liu, Wei Xiao, Jianming Yang, Ruru Ma, Liming Ding, Feng Liu, Chun‐Gang Duan, Mats Fahlman, Qinye Bao

2020Advanced Materials163 citationsDOI

Abstract

Ternary architecture is one of the most effective strategies to boost the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, an OSC with a ternary architecture featuring a highly crystalline molecular donor DRTB-T-C4 as a third component to the host binary system consisting of a polymer donor PM6 and a nonfullerene acceptor Y6 is reported. The third component is used to achieve enhanced and balanced charge transport, contributing to an improved fill factor (FF) of 0.813 and yielding an impressive PCE of 17.13%. The heterojunctions are designed using so-called pinning energies to promote exciton separation and reduce recombination loss. In addition, the preferential location of DRTB-T-C4 at the interface between PM6 and Y6 plays an important role in optimizing the morphology of the active layer.

Topics & Concepts

Materials scienceTernary operationBoosting (machine learning)Charge (physics)Photovoltaic systemOptoelectronicsEngineering physicsNanotechnologyArtificial intelligenceElectrical engineeringComputer scienceParticle physicsPhysicsEngineeringProgramming languageOrganic Electronics and PhotovoltaicsSilicon and Solar Cell TechnologiesSemiconductor materials and interfaces