Efficiency Improvement of Organic Photovoltaic Solar Cells via Spin Radical Doping

Authors : Kevser Şahin Tıraş

Pages : 68-74

View : 45 | Download : 55

Publication Date : 2024-04-30

Article Type : Research Paper

Abstract :Upon absorption of the sunlight, an excited energy state called exciton is generated in organic photovoltaics (OPV). There exist two kinds of excitons, singlet and triplet excitons. In OPV, the power conversion efficiency (PCE) is limited by the short lifetime of singlet excitons since they recombine quickly. To overcome this problem, we have introduced the spin ½ radical galvinoxyl into the MEH-PPV: PCBM bulk heterojunction to harvest triplets efficiently. The photovoltaic device shows an enhancement in PCE compared to the device without galvinoxyl. To reveal the underlying mechanism for the increase in PCE, magneto-photoconductance (MPC) of the OPVs was measured for the films, doped with various galvinoxyl concentration rates.
Keywords : Organik fotovoltaik, Manyetik alan etkisi, Polimerler