Bilayer-Ternary Polymer Solar Cells Fabricated Using Spontaneous Spreading on Water

被引：29
作者：
Colberts, Fallon J. M. [1 ]
Wienk, Martijn M. [1 ]
Heuvel, Ruurd [1 ]
Li, Weiwei [2 ]
Le Corre, Vincent M. [3 ]
Koster, L. Jan Anton [3 ]
Janssen, Rene A. J. [1 ,4 ]
机构：
[1] Eindhoven Univ Technol, Inst Complex Mol Syst, Mol Mat & Nanosyst, POB 513, NL-5600 MB Eindhoven, Netherlands
[2] Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[3] Univ Groningen, Zernike Inst Adv Mat, Photophys & Optoelect, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[4] Dutch Inst Fundamental Energy Res, Zaale 20, NL-5612 AJ Eindhoven, Netherlands
来源：
ADVANCED ENERGY MATERIALS | 2018年 / 8卷 / 32期
基金：
欧洲研究理事会;
关键词：
bilayer-ternary solar cells; polymer solar cells; sequential deposition; spontaneous spreading; CHARGE-LIMITED CURRENTS; EFFICIENCY;
D O I：
10.1002/aenm.201802197
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A new method is presented to fabricate bilayer organic solar cells via sequential deposition of bulk-heterojunction layers obtained using spontaneous spreading of polymer-fullerene blends on a water surface. Using two layers of a small bandgap diketopyrrolopyrrole polymer-fullerene blend, a small improvement in power conversion efficiency (PCE) from 4.9% to 5.1% is obtained compared to spin-coated devices of similar thickness. Next, bilayer-ternary cells are fabricated by first spin coating a wide bandgap thiophene polymer-fullerene blend, followed by depositing a small bandgap diketopyrrolopyrrole polymer-fullerene layer by transfer from a water surface. These novel bilayer-ternary devices feature a PCE of 5.9%, higher than that of the individual layers. Remarkable, external quantum efficiencies (EQEs) over 100% are measured for the wide bandgap layer under near-infrared bias light illumination. Drift-diffusion calculations confirm that near-infrared bias illumination can result in a significant increase in EQE as a result of a change in the internal electric field in the device, but cannot yet account for the magnitude of the effect. The experimental results indicate that the high EQEs over 100% under bias illumination are related to a barrier for electron transport over the interface between the two blends.
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页数：12
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