Enhanced Efficiency in Plastic Solar Cells via Energy Matched Solution Processed NiOx Interlayers

被引：309

作者：

Steirer, K. Xerxes ^{[2
]}

Ndione, Paul F. ^{[1
]}

Widjonarko, N. Edwin ^{[5
]}

Lloyd, Matthew T. ^{[1
]}

Meyer, Jens ^{[6
]}

Ratcliff, Erin L. ^{[3
,4
]}

Kahn, Antoine ^{[6
]}

Armstrong, Neal R. ^{[3
,4
]}

Curtis, Calvin J. ^{[1
]}

Ginley, David S. ^{[1
]}

Berry, Joseph J. ^{[1
]}

Olson, Dana C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Natl Ctr Photovolta, Golden, CO 80401 USA

[2] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA

[3] Univ Arizona, Dept Chem & Biochem, Tucson, AZ 85721 USA

[4] Univ Arizona, Ctr Interface Sci Solar Elect Mat, Tucson, AZ 85721 USA

[5] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[6] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

来源：

ADVANCED ENERGY MATERIALS | 2011年 / 1卷 / 05期

关键词：

HOLE TRANSPORT LAYERS; OPEN-CIRCUIT VOLTAGE; INDIUM-TIN-OXIDE; PHOTOVOLTAIC DEVICES; PLASMA TREATMENT; THIN-FILMS; POLYMER; INTERFACES; PHOTOEMISSION; SPECTROSCOPY;

D O I：

10.1002/aenm.201100234

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：

We show enhanced efficiency and stability of a high performance organic solar cell (OPV) when the work-function of the hole collecting indium-tin oxide (ITO) contact, modified with a solution-processed nickel oxide (NiOx) hole-transport layer (HTL), is matched to the ionization potential of the donor material in a bulk-heterojunction solar cell. Addition of the NiOx HTL to the hole collecting contact results in a power conversion efficiency (PCE) of 6.7%, which is a 17.3% net increase in performance over the 5.7% PCE achieved with a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) HTL on ITO. The impact of these NiOx films is evaluated through optical and electronic measurements as well as device modeling. The valence and conduction band energies for the NiOx HTL are characterized in detail through photoelectron spectroscopy studies while spectroscopic ellipsometry is used to characterize the optical properties. Oxygen plasma treatment of the NiOx HTL is shown to provide superior contact properties by increasing the ITO/NiOx contact work-function by 500 meV. Enhancement of device performance is attributed to reduction of the band edge energy offset at the ITO/NiOx interface with the poly(N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4', 7'-di-2-thienyl-2', 1', 3'-benzothidiazole) (PCDTBT):[6,6]-phenyl-C61 butyric acid methyl ester PCBM and [6,6]-phenyl-C71 butyric acid methyl ester (PC70BM) active layer. A high work-function hole collecting contact is therefore the appropriate choice for high ionization potential donor materials in order to maximize OPV performance.

引用

页码：813 / 820

页数：8

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