Prof. Shiming Zhang
Professor, Nanjing Tech University
Organic Semiconductors for OPV and OFET
Simiao Yu (1), Jianwei Yu (1), and Shiming Zhang (* 1,2) (1) Institute of advanced materials Nanjing Tech University Xin mofan road 5, Nanjing, 210009 P. R. China (2) Nanjing Enteng Electronics Pte. Ltd, Zifeng 2 Building 3 level 3, Nanjing, China
Organic semiconductors are promising candidates for next generation of flexible electronics owing their intrinsically light-weight, prominent flexibility, and potential for low-cost. In this contribution, we developed a series of novel organic semiconductor including small molecular acceptor IDT-Tz, two phthalimide-based wide bandgap polymers TPhI-BDT and TffPhI-BDT, and 2,1,3-benzothiadiazole-5,6-dicarboxylicimide (BTZI) based polymers P1, P2 and P3. For IDT-Tz, through employing thiazole unit as the π-bridges, the non-fullerene acceptor showed a PCE of 8.5%, twice of that thiophene based IDT. Both TPhI-BDT and TffPhI-BDT exhibited good OPV performance. When incorporated into non-fullerene OSCs, polymer TPhI-BDT shows a PCE of 8.31% with a Voc of 0.90 V, a Jsc of 14.07 mA cm-2, and a FF of 65.99%. The fluorine containing analogue polymer TffPhI-BDT exhibits an improved PCE of 9.48% with a larger Voc of 0.93 V, a Jsc of 15.92 mA cm-2, and a FF of 63.89%. P1 and P3 show substantial and balanced ambipolar transport with electron mobilities/hole mobilities of up to 0.86/0.51 and 0.95/0.50 cm2 V-1 s-1, respectively. Polymer P2 containing the strongest donor unit exhibit unipolar p-type performance with an average hole mobility of 0.40 cm2 V-1s-1. When incorporated into bulk heterojunction polymer solar cells, the narrow bandgap (1.13 eV) polymer P1 shows an encouraging power conversion efficiency of 4.15% with a relative large open-circuit voltage of 0.69 V, which corresponds to a remarkably small energy loss of 0.44 eV.
 S. Zhang, et al, J. Mater. Chem. A, 2017, 5, 21674.
 S. Zhang, et al, ACS Appl. Mater. Interfaces, 2017, 9, 42167.
 S. Zhang, et al, Macromolecules, 2017, 50 (22), 8928.
Shiming Zhang received his PhD in 2009 from the Institute of Chemistry, Chinese Academy of Sciences, and subsequently began two years of postdoctoral research within the Department of Chemistry at Northwestern University under the supervision of Prof. Tobin J. Marks and Antonio Facchetti. He worked at KAUST (Saudi Arabia) as a postdoctoral fellow from 2011 to 2012, after which he moved to Singapore to work in Silecs International as a senior chemist from 2012 to 2014 and WinTech Nano as a quality lead/principal engineer from 2014 to 2015. In 2015 he joined the Institute of Advanced Materials (IAM) and began his professorship at Nanjing Tech University (NanjingTech) as a professor. His research interests include organic/flexible electronics and microelectronics-packaging materials.
Nanjing Tech University, a comprehensive university with engineering as its focus, has a history of more than one hundred years as a cradle of education. It is a key institution of higher learning to be constructed in Jiangsu Province, and one of the first group of institutions of higher learning approved by the Chinese Ministry of Education for the training of “Excellent Engineers”.