Magnetoconductance Effect of Organic Solar Cell due to the Conservation Rule of Electron Spin Angular Momentum

2016 Fiscal Year Final Research Report

• Project/Area Number: 26410088
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Niigata University
• Principal Investigator: Tadaaki Ikoma 新潟大学, 自然科学系, 教授 (10212804)
• Co-Investigator(Renkei-kenkyūsha): WAKIKAWA Yusuke 静岡理工科大学, 先端機器分析センター, 研究員 (90708512)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電子スピン角運動量保存 / 磁気伝導効果 / 有機太陽電池 / キャリア動力学 / 電荷再結合 / 一重項励起子解裂 / トラップ反応

Outline of Final Research Achievements

To overcome main factors lowering the energy conversion efficiency of organic solar cells (OSCs), recently there is great interest in singlet fission and triplet fusion because of the potentially ultrahigh efficiency of the conversion from photon to charge. In those elementary dynamics, the electron spin plays an essential role due to the conservation of angular momentum. Here we show that the magnetoconductance (MC) effect originated from depressing the spin mixing in encounter pairs under the external magnetic field provides quantitative information about the singlet fission, the charge recombination and the trap-related dynamics with triplet exciton in a bilayer device of pentacene|fullerene. The results obtained by the simple non-destructive MC measurements indicate that energy turning and/or harvest of the triplet excitons are key issues for enhancing the performance of OSCs.

Free Research Field

物理化学