Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230151.doi: 10.7503/cjcu20230151

• Review • Previous Articles     Next Articles

Progress on the Efficiency Regulation of Organic Solar Cells by Volatile Solid Additives

SONG Xin1,2(), GAO Shenzheng1, XU Shanlei1, XU Hao1, ZHOU Xinjie1, ZHU Mengbing1, HAO Rulin1, ZHU Weiguo1()   

  1. 1.School of Materials Science and Engineering,Jiangsu Engineering Laboratory of Light?Electricity?Heat Energy?Converting Materials and Applications,Changzhou University,Changzhou 213164,China
    2.Key Laboratory of Advanced Energy Materials Chemistry,Ministry of Education,College of Chemistry,Nankai University,Tianjin 300071,China
  • Received:2023-03-30 Online:2023-09-10 Published:2023-05-18
  • Contact: SONG Xin, ZHU Weiguo E-mail:xin.song@cczu.edu.cn;zwg18@126.com
  • Supported by:
    the National Natural Science Foundation of China(62105129);the Natural Science Foundation of Jiangsu Province, China(BK20200591)

Abstract:

Bulk heterojunction(BHJ) organic solar cells(OSCs) are considered a promising photovoltaic technology due to their solution-processability, eco-friendliness, non-toxicity, and flexibility. The nanoscale morphology of the active layer is a key factor that determines device performance and stability. Researchers have developed various morphology optimization methods, such as thermal annealing, solvent annealing, and solvent additives. However, these treatment methods are incompatible with large-area printing processes and may compromise the internal morphology and device performance stability. Consequently, it is essential to screen a simple yet efficient approach for morphology control in OSC area. In recent years, volatile solid additives have emerged as a feasible direction to improve the energy conversion efficiency(PCE) and stability of OSCs due to their unique molecular properties, which can form strong interaction forces with donor/acceptor molecules. This article systematically summarized the research status of non-halogenated and halogenated volatile solid additives in regulating the morphology and photovoltaic performance of OSCs. We deeply discussed the different mechanisms of optimizing active layer morphology by volatile solid additives, including molecular adsorption energy, interaction between donor and acceptor, crystal nucleation, and growth. Finally, this article analyzed the challenges and future development trends of volatile solid additive.

Key words: Organic solar cell, Volatile solid additive, Non-fullerene acceptor, Photovoltaic performance, Intermolecular interaction

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