Translating local binding energy to a device effective one

Abstract

While nonfullerene acceptors based organic photovoltaics reaching high power conversion efficiency, their binding energy is 150–500 meV. Here there is a model considering disorder and entropy that able to quantitatively explain this controversy.

15% enhancement of the photocurrent at the maximum power point of a thin film solar cell

“…Although we have developed extensive modeling based analysis of solar cells, 12,42 these models contained the hidden assumption that the device structure is a standard one. The energy level diagram, in Fig.…”

“…[6][7][8][9][10] It has also been suggested that the inevitable presence of disorder contributes favourably to charge generation. [11][12][13] Understanding the physics of the efficiency of rate of transition from the bound charge transfer (CT) state to free carrier is of immense importance and has been a topic of intensive investigation. [14][15][16] We note that this list nowhere represents the amount of work that has been done in the last 10 years and much can be found in recent reviews.…”

Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

“…The Coulomb interaction between an electron and a hole in CTE exceeds dramatically thermal energy at room temperature due to the small intermolecular distance (∼1 nm) and relatively small dielectric constant ( ). In this review we do not enter into the discussion about CTE dissociation mechanisms and how the dissociation may be enhanced [35–39] . Importantly CTEs do dissociate to free polarons and contribute to the photocurrent (PC) generated by the OS solar cell.…”

“…In this review we do not enter into the discussion about CTE dissociation mechanisms and how the dissociation may be enhanced. [35][36][37][38][39] Importantly CTEs do dissociate to free polarons and contribute to the photocurrent (PC) generated by the OS solar cell. Here we focus on the effect of CTE dissociation on the magnetic field response of PC.…”

Exciton Binding Energy in Organic Polymers: Experimental Considerations and Tuning Prospects

“…The binding energy of the exciton (E b ) influences the optical, electronic, and charge transport properties of the material. [1,2] Therefore, understanding exciton formation, dissociation mechanisms and exciton binding energy, is crucial for unraveling the fundamental photo-physics and enhancing the efficiency of optoelectronic devices, including organic solar cells (OSCs), [3][4][5] and organic photocatalysis for H 2 evolution reaction (HER). [6,7] Excitons can be classified into Frenkel, Wannier-Mott (WM), and chargetransfer (CT) excitons based on their binding energy and degree of delocalization.…”