<b>Influence of doped-charge transport layers on the photovoltaic performance of donor-acceptor blend p-i-n type organic solar cells</b>

• Main Authors: D. Gebeyehu, B. Maennig, J. Drechsel, K. Leo, M. Pfeiffer
• Format: Article
• Language: English
• Published: Chemical Society of Ethiopia 2004-06-01
• Series: Bulletin of the Chemical Society of Ethiopia
• Subjects: Doped-charge transport layers; Organic solar cells; Photovoltaic cells; Phthalocyanine-fullerene
• Online Access: http://www.ajol.info/index.php/bcse/article/view/61645

This report demonstrates external power conversion efficiencies of 2% under 100 mW/cm2 simulated AM1.5 illumination for organic thin-film photovoltaic cells using a phthalocyanine-fullerene (ZnPc/C₆₀) bulk heterojunction as an active layer, embedded into a p-i-n type architecture with doped wide-gap charge transport layers. For an optically optimized device, we found internal quantum efficiency (IQE) of above 80% under short circuit conditions. Such optically thin cells with high internal quantum efficiency are an important step towards high efficiency tandem cells. The p-i-n architecture allows for the design of solar cells with high internal quantum efficiency where only the photoactive region absorbs visible light and recombination losses at contacts are avoided. The I-V characteristics, power conversion efficiencies, the dependence of short circuit current on incident white light intensity, incident photon to collected electron efficiency (IPCE) and absorption spectra of the active layer system are discussed.