Translator Disclaimer
12 November 2019 Investigation of low-bandgap nonfullerene acceptor-based polymer solar cells with very low photovoltage loss
Author Affiliations +

Polymer solar cells (PSCs) have seen great progress in recent years, with power conversion efficiencies of over 15%. However, PSCs suffer from larger energy losses than inorganic and perovskite solar cells, leading to lower open-circuit voltage (VOC). The main factors that hinder the VOC improvements include (i) relatively large nonradiative recombination losses and thus low electroluminescence quantum efficiency (EQEEL) in PSCs and (ii) the existence of a charge transfer state at the interface of donor and acceptor. For efficient charge separation in state-of-the-art PSCs, empirically, the driving force for exciton dissociation is considered to be at least 0.3 eV. The large driving force could lead to large voltage losses and thus hinder the PSC performance. In this study, we report using wide bandgap material PB3T as electron donor and low bandgap material IEICO-4F as electron acceptor for nonfullerene PSCs with very small driving forces, which, however, show a decent maximum external quantum efficiency (EQE) of nearly 40%. Moreover, we demonstrate a nonfullerene PSC with high EQEEL up to 5.1  ×  10  −  4, corresponding to very low nonradiative recombination losses of 0.20 eV and overall photovoltage energy losses of 0.46 to 0.52 eV, derived from different bandgap (Egap) determination methods, which can now be comparable to those in perovskite solar cells and inorganic solar cells.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2019/$28.00 © 2019 SPIE
Ying Zhang, Delong Liu, Patrick W. K. Fong, and Gang Li "Investigation of low-bandgap nonfullerene acceptor-based polymer solar cells with very low photovoltage loss," Journal of Photonics for Energy 9(4), 045502 (12 November 2019).
Received: 25 June 2019; Accepted: 18 October 2019; Published: 12 November 2019


The photophysics of perovskite solar cells
Proceedings of SPIE (September 08 2014)
Ultrafast exciton dissociation at donor/acceptor interfaces
Proceedings of SPIE (September 10 2013)
The luminescent concentrator illuminated
Proceedings of SPIE (May 11 2006)
Solar cells based on a polymer blend with a maximum...
Proceedings of SPIE (October 03 2005)
Modelling of organic triple-junction solar cells
Proceedings of SPIE (April 30 2012)

Back to Top