Supporting Information for Energy Environ. Sci., Cite this: DOI: 10.1039/x0xx00000x Dopant–Free Polymeric Hole Transport Material for Highly Efficient and Stable Perovskite Solar Cells Guan-Woo Kim a‡ , Gyeongho Kang a‡ , Jinseck Kim b , Gang-Young Lee a , Hong Il Kim a , Limok Pyeon a and Jaechol Lee b , Taiho Park a* [*] Prof. Taiho Park. Corresponding-Author [ ‡ ] There authors are contributed equally to this manuscript. a Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-gu, Pohang, Kyoungbuk, Korea. Fax: +82-54-279-8298; Tel: 82-54-279-2394; E-mail: taihopark@postech.ac.kr b Future Technology Research Center, Corporate R&D, LG Chem Research Park, 188, Moonji-ro, Yuseong-gu, Daejeon, 34122, Republic of Korea. Tel: +82-42-870-6818 Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is © The Royal Society of Chemistry 2016