Effects of magnetic nanoparticles and external magnetostatic field on the bulk heterojunction polymer solar cells

Scientific Reports
Kai WangXiong Gong

Abstract

The price of energy to separate tightly bound electron-hole pair (or charge-transfer state) and extract freely movable charges from low-mobility materials represents fundamental losses for many low-cost photovoltaic devices. In bulk heterojunction (BHJ) polymer solar cells (PSCs), approximately 50% of the total efficiency lost among all energy loss pathways is due to the photogenerated charge carrier recombination within PSCs and low charge carrier mobility of disordered organic materials. To address these issues, we introduce magnetic nanoparticles (MNPs) and orientate these MNPS within BHJ composite by an external magnetostatic field. Over 50% enhanced efficiency was observed from BHJ PSCs incorporated with MNPs and an external magnetostatic field alignment when compared to the control BHJ PSCs. The optimization of BHJ thin film morphology, suppression of charge carrier recombination, and enhancement in charge carrier collection result in a greatly increased short-circuit current density and fill factor, as a result, enhanced power conversion efficiency.

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Citations

Apr 19, 2016·Chemical Society Reviews·Kai WangXiong Gong
Feb 9, 2016·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Peng SongMengtao Sun
Oct 17, 2019·Physical Chemistry Chemical Physics : PCCP·Dorota LachowiczAndrzej Bernasik
Sep 12, 2020·ACS Applied Materials & Interfaces·Wenzhan XuXiong Gong

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Methods Mentioned

BETA
atomic
transmission electron microscopy
AFM

Software Mentioned

GISAXS

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