مشخصات پژوهش

عنوان	Microwave activated synthesis of Ag2S and Ag2S@ZnS nanocrystals and their application in well-performing quantum dot sensitized solar cells
نوع پژوهش	مقاله چاپ‌شده
کلیدواژه‌ها	Ag2S@ZnS quantum dots; QD sensitized solar cells; IPCE; Drop casting
چکیده	Incident photon-to-current conversion efficiency (IPCE) of CdS based quantum dot sensitized solar cells (QDSCs) is a major drawback in their low efficiency. Here we report a new trend in fabrication of QDSC with enhanced IPCE with application of as prepared Ag2S and Ag2S@ZnS QDs as a co sensitizer. Ag2S and Ag2S@ZnS QDs were synthesized first using a microwave method and were examined by means of XRD, TEM and UV–Vis spectroscopy. Then the prepared QDs were applied for the fabrication of QDSCs using a novel drop casting method. The results revealed a significant enhancement of IPCE as well as short current density (12.5 mA·cm−2) and cell efficiency (3%). The enhancement is directly related to well absorption of Ag2S with low band gap in the visible range and effective injection of photo-excited electrons to CdS compact layer according to suggested band diagram. Ag2S@ZnS co-sensitizer showed an enhancement in photocurrent density due to successful passivation of Ag2S QDs and suppressing recombination on their surface.
پژوهشگران	مهدی ملایی (نفر چهارم)، مسعود کریمی پور (نفر سوم)، مازیار مرندی (نفر دوم)، فرخنده سادات میراحمدی (نفر اول)