Efficiency enhancement of hybrid perovskite solar cells with MEH-PPV hole-transporting layers

Hsin Wei Chen, Tzu Yen Huang, Ting Hsiang Chang, Yoshitaka Sanehira, Chung Wei Kung, Chih Wei Chu, Masashi Ikegami, Tsutomu Miyasaka, Kuo Chuan Ho

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52 Citations (Scopus)

Abstract

In 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).

Original languageEnglish
Article number34319
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Oct 4

All Science Journal Classification (ASJC) codes

  • General

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