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Semi‐Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency
Author(s) -
Tang Zheng,
George Zandra,
Ma Zaifei,
Bergqvist Jonas,
Tvingstedt Kristofer,
Vandewal Koen,
Wang Ergang,
Andersson L. Mattias,
Andersson Mats R.,
Zhang Fengling,
Inganäs Olle
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200204
Subject(s) - materials science , polymer solar cell , optoelectronics , organic solar cell , energy conversion efficiency , solar cell , quantum efficiency , plasmonic solar cell , transmittance , hybrid solar cell , quantum dot solar cell , pedot:pss , tandem , cathode , absorption (acoustics) , photocurrent , anode , electrode , polymer , composite material , chemistry
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 (∼90%) and high transmittance (∼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.