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http://cio.repositorioinstitucional.mx/jspui/handle/1002/614| FACTORS THAT AFFECT THE LIFETIME OF PTB7:PC71BM-BASED SOLAR CELLS USING FIELD’S METAL AS TOP ELECTRODE | |
| Mirna Denisse Barreiro | |
| Gabriel Ramos-Ortiz | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| ORGANIC SOLAR CELLS, STABILITY, ALTERNATIVE ELECTRODES | |
| "In this thesis the photovoltaic (PV) performance and stability of OSCs based on the well-known system PTB7:PCBM and the use of an alternative metal cathod (deposited at low temperature under vacuum free conditions) are studied. In a first part of this thesis, the influence of an electron extraction layer (EEL) and the use of a novel top electrode called Field's metal (FM) deposited by drop casting at regular atmosphere on the PV performance are investigated. Charge extraction and losses involved with the use of FM and PFN as EEL were analyzed using equivalent circuit models for the architecture: ITO/PEDOT:PSS/PTB7:PCBM/PFN/FM. Power conversion efficiencies (PCEs) higher than 6\% were reached with this architecture. Additional electrical characterization, through impedance spectroscopy, was also carried out. The obtained PV parameters are similar to those exhibited by devices comprising standard top electrodes, i.e., Al, deposited through a high-vacuum evaporation process. In the second part of this thesis, and once the fabrication processes was optimized, we proceeded to analyze the scaling effect of the active area using the aforementioned architecture. The cells were scaled by a factor of 25 from 0.09 cm2 to 2.25 cm2, and FM was deposited by doctor blade technique at regular atmosphere. Small active area (0.09 cm2) devices resulted in PCE of 7.4 +- 0.8 %. However, PCE decreased 60 % for scaled OPVs (2.25 cm2). After analyzing the initial performance, the attention was focused on the factors that determine the degradation of these devices. Studies of stability as a function of the active area were performed in accordance with the ISOS-L1 (laboratory simulation of constant lighting) and ISOS-D1 (shelf storage) protocols for devices tested in air and without encapsulation. The time to reach 50\% of the initial PCE ($T_{50}$) is about 14 h and 2000 h under ISOS-L1 and ISOS-D1 protocols, respectively, with a tendency of stability improvement for scaled devices. According to our results, the use of FM as top electrode and doctor blade technique for its deposition, could possibly produce an encapsulation effect or a delay in the degradation process.Nevertheless, to make a fair conclusion on this aspect, more experiments have to be carry out. A whole PV analysis through the single diode model, impedance spectroscopy, and light beam induced voltage (LBIV) measurements is presented." | |
| 2018-04 | |
| Tesis de doctorado | |
| Inglés | |
| León, Guanajuato | |
| Público en general | |
| Barreiro Argüelles, (2018). "Factors that affect the lifetime of PTB7:PC71BM-based solar cells using Field's metas as top electrode". Tesis de Doctorado en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 93 pp. | |
| ÓPTICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | DOCTORADO EN CIENCIAS (ÓPTICA) |
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