Semi-Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency
Artikel i vetenskaplig tidskrift, 2012

Semi-transparent (ST) organic solar cells with potential application as power generating windows are studied. The main challenge is to find proper transparent electrodes with desired electrical and optical properties. In this work, this is addressed by employing an amphiphilic conjugated polymer PFPA-1 modified ITO coated glass substrate as the ohmic electron-collecting cathode and PEDOT:PSS PH1000 as the hole-collecting anode. For active layers based on different donor polymers, considerably lower reflection and parasitic absorption are found in the ST solar cells as compared to solar cells in the standard geometry with an ITO/PEDOT:PSS anode and a LiF/Al cathode. The ST solar cells have remarkably high internal quantum efficiency at short circuit condition (similar to 90%) and high transmittance (similar to 50%). Hence, efficient ST tandem solar cells with enhanced power conversion efficiency (PCE) compared to a single ST solar cell can be constructed by connecting the stacked two ST sub-cells in parallel. The total loss of photons by reflection, parasitic absorption and transmission in the ST tandem solar cell can be smaller than the loss in a standard solar cell based on the same active materials. We demonstrate this by stacking five separately prepared ST cells on top of each other, to obtain a higher photocurrent than in an optimized standard solar cell.

semi-transparent solar cells


conjugated polymers



tandem solar cells

fill factors

modified cathode


polymer solar cells

photovoltaic devices




Z. Tang

Linköpings universitet

Zandra George

Chalmers, Kemi- och bioteknik, Polymerteknologi

Z. F. Ma

Linköpings universitet

J. Bergqvist

Linköpings universitet

K. Tvingstedt

Linköpings universitet

K. Vandewal

Linköpings universitet

Ergang Wang

Chalmers, Kemi- och bioteknik, Polymerteknologi

L. M. Andersson

Linköpings universitet

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Fengling Zhang

Linköpings universitet

Olle Inganäs

Linköpings universitet

Advanced Energy Materials

1614-6832 (ISSN) 1614-6840 (eISSN)

Vol. 2 12 1467-1476



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