Hole‐Transporting Small Molecules Based on Thiophene Cores for High Efficiency Perovskite Solar Cells

• DOI: 10.1002/cssc.201402587
• Publication Date: 2014-09-18T20:34:32Z
• Authors: Hairong Li; Kunwu Fu; Pablo P. Boix; Lydia H. Wong; Anders Hagfeldt; Michael Grätzel; Subodh G. Mhaisalkar; Andrew C. Grimsdale
• Keywords: Tetra

Abstract Two new electron‐rich molecules, 2,3,4,5‐tetra[4,4′‐bis(methoxyphenyl)aminophen‐4“‐yl]‐thiophene (H111) and 4,4′,5,5′‐tetra[4,4′‐bis(methoxyphenyl)aminophen‐4”‐yl]‐2,2′‐bithiophene (H112), which contain thiophene cores with arylamine side groups, are reported. When used as the hole‐transporting material (HTM) in perovskite‐based solar cell devices, power conversion efficiencies of up to 15.4 % under AM 1.5G simulation were obtained. This is highest efficiency achieved HTMs not composed 2,2′,7,7′‐tetrakis( N , ′‐di‐ p ‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) its isomers. Both HTMs, especially H111, have great potential replace expensive spiro‐OMeTAD given their much simpler less syntheses.