Chen H.-W.Huang T.-Y.Chang T.-H.Sanehira Y.Kung C.-W.Chu C.-W.Ikegami M.Miyasaka T.Ho K.-C.2019-05-172019-05-17201620452322https://scholars.lib.ntu.edu.tw/handle/123456789/408694In this study, hybrid perovskite solar cells are fabricated using poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and poly(3-hexylthiophene-2,5-diyl) (P3HT) as dopant-free hole-transporting materials (HTMs), and two solution processes (one- and two-step methods, respectively) for preparing methylammonium lead iodide perovskite. By optimizing the concentrations and solvents of MEH-PPV solutions, a power conversion efficiency of 9.65% with hysteresis-less performance is achieved, while the device with 2,2¡¬,7,7¡¬-tetrakis(N,N-di-p-methoxyphenylamine)-9,9¡¬spirobifluorene (Spiro-OMeTAD) doped with lithium salts and tert-butylpyridine (TBP) exhibits an efficiency of 13.38%. This result shows that non-doped MEH-PPV is a suitable, low-cost HTM for efficient polymer-based perovskite solar cells. The effect of different morphologies of methylammonium lead iodide perovskite on conversion efficiency is also investigated by incident photon-to-electron conversion efficiency (IPCE) curves and electrochemical impedance spectroscopy (EIS). ? The Author(s) 2016.journal article10.1038/srep343192-s2.0-84989830455https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989830455&doi=10.1038%2fsrep34319&partnerID=40&md5=0b571d36153e13462a75604a81cd9c3b