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).
Highlights
The electronic properties of conjugated polymers possibly depend on film processing conditions, such as solvent, solution concentration, additives, and methods or conditions of film preparation[31]
Masi et al have reported an MEH-PPV with perovskite for fabricating an optoelectronic device with polymer or perovskite nanocomposites[32], which exhibits an inferior efficiency of 3%, the structure of the devices in their study is significantly different from those fabricated
Perovskite solar cells with different holetransporting materials (HTMs) were fabricated under ambient air conditions; details are described in methods part
Summary
The electronic properties of conjugated polymers possibly depend on film processing conditions, such as solvent, solution concentration, additives, and methods or conditions of film preparation[31]. Masi et al have reported an MEH-PPV with perovskite for fabricating an optoelectronic device with polymer or perovskite nanocomposites[32], which exhibits an inferior efficiency of 3%, the structure of the devices in their study is significantly different from those fabricated . Their device structure is similar to that of the bulk hetero-junction solar cells by exploiting polymers as the template agent and forming perovskite inside the polymer matrix as the nanocomposite film, which is obtained from a MEH-PPV, methylammonium iodide, and lead iodide blend solution in a binary mixture of solvents tetrahydrofurane (THF) and N,N-dimethylformamide (DMF)[32]. The combination of dopant-free MEH-PPV and CH3NH3PbI3 is used in the present study, attaining a final device efficiency of 9.65%; to the best of our knowledge, this efficiency is the highest reported value for a solar cell using MEH-PPV as an HTM
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