Enabling low voltage losses and high photocurrent in fullerene-free organic photovoltaics

Abstract Despite significant development recently, improving the power conversion efficiency of organic photovoltaics (OPVs) is still an ongoing challenge to overcome. One of the prerequisites to achieving this goal is to enable efficient charge separation and small voltage losses at the same time. In this work, a facile synthetic strategy is reported, where optoelectronic properties are delicately tuned by the introduction of electron-deficient-core-based fused structure into non-fullerene acceptors. Both devices exhibited a low voltage loss of 0.57 V and high short-circuit current density of 22.0 mA cm −2 , resulting in high power conversion efficiencies of over 13.4%. These unconventional…

• NN
  National Natural Science Foundation of China

  Awards: 21875286, 2017YFA0206600
• LU
  Linköpings Universitet

  Awards: 2009-00971, SFO-Mat-LiU #2009-00971, 2017YFA0206600
• E
  Energimyndigheten

  Award: 2016-010174
• DY
  Distinguished Young Scholar Foundation of Hunan Province
• AF
  Air Force Office of Scientific Research

  Awards: FA9550-, FA2386-15-1-4108, MRPI 328368, FA2386, FA9550-15-1-0333, FA9550, FA9550e15-1e0610
• LB
  Lawrence Berkeley National Laboratory