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- 저자 : Castrucci, Jeffrey S. (검색결과 2 건)
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Carbon nanotube/silicon hybrid heterojunctions for photovoltaic devices
Castrucci, Paola Techno-Press 2014 Advances in nano research Vol.2 No.1
The significant growth of the Si photovoltaic industry has been so far limited due to the high cost of the Si photovoltaic system. In this regard, the most expensive factors are the intrinsic cost of silicon material and the Si solar cell fabrication processes. Conventional Si solar cells have p-n junctions inside for an efficient extraction of light-generated charge carriers. However, the p-n junction is normally formed through very expensive processes requiring very high temperature (${\sim}1000^{\circ}C$). Therefore, several systems are currently under study to form heterojunctions at low temperatures. Among them, carbon nanotube (CNT)/Si hybrid solar cells are very promising, with power conversion efficiency up to 15%. In these cells, the p-type Si layer is replaced by a semitransparent CNT film deposited at room temperature on the n-doped Si wafer, thus giving rise to an overall reduction of the total Si thickness and to the fabrication of a device with cheaper methods at low temperatures. In particular, the CNT film coating the Si wafer acts as a conductive electrode for charge carrier collection and establishes a built-in voltage for separating photocarriers. Moreover, due to the CNT film optical semitransparency, most of the incoming light is absorbed in Si; thus the efficiency of the CNT/Si device is in principle comparable to that of a conventional Si one. In this paper an overview of several factors at the basis of this device operation and of the suggested improvements to its architecture is given. In addition, still open physical/technological issues are also addressed.
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Lee, Kwang-Hee,Leem, Dong-Seok,Castrucci, Jeffrey S.,Park, Kyung-Bae,Bulliard, Xavier,Kim, Kyu-Sik,Jin, Yong Wan,Lee, Sangyoon,Bender, Timothy P.,Park, Soo Young American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.24
<P>Green-sensitive organic photodetectors (OPDs) with high sensitivity and spectral selectivity using boron subphthalocyanine chloride (SubPc) derivatives are reported. The OPDs composed of SubPc and dicyanovinyl terthiophene derivative (DCV3T) demonstrated the highest green-sensitivity with maximum external quantum efficiency (EQE) of 62.6 % at an applied voltage of −5 V, but wide full-width-at-half-maximum (FWHM) of 211 nm. The optimized performance considering spectral selectivity was achieved from the composition of <I>N</I>,<I>N</I>-dimethyl quinacridone (DMQA) and SubPc showing the high specific detectivity (<I>D*</I>) of 2.34 × 10<SUP>12</SUP> cm Hz<SUP>1/2</SUP>/W, the EQE value of 60.1% at −5 V, and narrow FWHM of 131 nm. In spite of the sharp absorption property of SubPc with the maximum wavelength (λ<SUB>max</SUB>) at 586 nm, the EQE spectrum showed favorable green-sensitivity characterized by smooth waveform with λ<SUB>max</SUB> at 560 nm, which is induced from the high reflectance of SubPc centered at 605 nm. The photoresponsivity of the OPD devices was found to be consistent with their absorptance. Optimized DMQA/SubPc device showed the lowest value of blue crosstalk (0.42) and moderate red crosstalk (0.37), suggesting its promising application as a green-sensitive OPD.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-24/am404122v/production/images/medium/am-2013-04122v_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am404122v'>ACS Electronic Supporting Info</A></P>
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