Tuning back contact property via artificial interface dipoles in Si/organic hybrid solar cells

Journal Article · Mon Jul 25 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4959839· OSTI ID:22594452

Wang, Dan ^[1]; Sheng, Jiang; Wu, Sudong; Zhu, Juye; Chen, Shaojie; Gao, Pingqi; Ye, Jichun ^[1]

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1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (China)

Back contact property plays a key role in the charge collection efficiency of c-Si/poly(3,4-ethylthiophene):poly(styrenesulfonate) hybrid solar cells (Si-HSCs), as an alternative for the high-efficiency and low-cost photovoltaic devices. In this letter, we utilize the water soluble poly (ethylene oxide) (PEO) to modify the Al/Si interface to be an Ohmic contact via interface dipole tuning, decreasing the work function of the Al film. This Ohmic contact improves the electron collection efficiency of the rear electrode, increasing the short circuit current density (J{sub sc}). Furthermore, the interface dipoles make the band bending downward to increase the total barrier height of built-in electric field of the solar cell, enhancing the open circuit voltage (V{sub oc}). The PEO solar cell exhibits an excellent performance, 12.29% power conversion efficiency, a 25.28% increase from the reference solar cell without a PEO interlayer. The simple and water soluble method as a promising alternative is used to develop the interfacial contact quality of the rear electrode for the high photovoltaic performance of Si-HSCs.

• OSTI ID: 22594452
• Journal Information: Applied Physics Letters, Vol. 109, Issue 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BENDING
CHARGE COLLECTION
CURRENT DENSITY
DIPOLES
EFFICIENCY
ELECTRIC FIELDS
ELECTRIC POTENTIAL
ELECTRICAL FAULTS
ELECTRODES
ELECTRONS
ETHYLENE
FILMS
INTERFACES
PHOTOVOLTAIC EFFECT
POLYETHYLENE GLYCOLS
SILICON SOLAR CELLS
TUNING
WATER
WORK FUNCTIONS