Organic Thin‐film Solar Cells Using Benzotrithiophene Derivatives Bearing Acceptor Units as Non‐Fullerene Acceptors

Abstract

diyl))tris(methaneylylidene))tris(3-octyl-4-oxothiazolidine-5,2-diylidene))trimalononitrile (2: BTT-OT-OTZDM) with a benzotrithiophene core, alkyl-thiophen units, and acceptor units were designed and synthesized. The HOMO-LUMO levels of 1 and 2 were determined by photoemission spectroscopy and UV-Vis absorption spectroscopy. Binary blend and ternary blend bulk heterojunction (BHJ) organic solar cells with non-fullerene acceptors 1 and 2 were fabricated with the inverted device structures of glass/ITO/ZnO/active_layer/MoO 3 /Ag. Both binary blend BHJ solar cells with 1 and 2 show lower J SC and larger V OC values than P3HT : PCBM solar cells. On the other hand, ternary blend BHJ organic solar cells, including 10 % of 1, exhibited a larger power conversion efficiency than P3HT : PCBM solar cells because the J SC value was largely improved.

3D Printed Skin‐Interfaced UV‐Visible Hybrid Photodetectors

“…The organic active materials, P3HT and PCBM, have bandgaps of ≈1.9 eV and ≈2.2 eV, [ 33 ] respectively, and have previously been 3D printed as a bulk heterojunction (BHJ) layer to detect light in the near UV to visible band. [ 31 ] To increase the light sensitivity in the UV range, we added ZnO NPs as UV absorbers (bandgap = ≈3.4 eV) into the active materials.…”