Study Of A Hybrid Schottky Photodiode Based On Zno And Pedot:Pss

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Trabalho

Título do Trabalho

STUDY OF A HYBRID SCHOTTKY PHOTODIODE BASED ON ZNO AND PEDOT:PSS

Autores

Luis Henrique Tigre Bertoldo
Gabriel L. Nogueira
Douglas Henrique Vieira
Maykel dos Santos Klem
Mayk Rodrigues Do Nascimento (DR); FCT - UNESP
Neri Alves

Modalidade

Apresentação - pôster (Clique aqui para saber os detalhes para submissão)

Área temática

Dispositivos eletrônicos e ópticos (OLED/OFET/OPVs/etc)

Data de Publicação

20/05/2022

País da Publicação

Brasil

Idioma da Publicação

Inglês

Página do Trabalho

https://www.even3.com.br/anais/workshopineo2022/473379-study-of-a-hybrid-schottky-photodiode-based-on-zno-and-pedot-pss

ISBN

Palavras-Chave

Schottky diode, ZnO, PEDOT:PSS, simulation.

Resumo

The zinc oxide (ZnO) is a wide bandgap semiconductor (~3.3 eV), which energy corresponds to the ultraviolet A spectrum (UVA), the range of the electromagnetic spectrum associated with a high potential to cause skin cancer. In this way, there is a huge interest in the application of ZnO as an active layer in RUV sensors. The aluminum-doped ZnO (AZO) can reach low sheet resistances such as ~100 ?/? and a transmittance higher than 90% [1], making it suitable for applications as transparent electrodes. The AZO can be obtained in situ during the synthesis of ZnO by spray pyrolysis onto a thin aluminum (Al) layer. In this process, the diffusive Al acts as a dopant to the first ZnO layers, forming an AZO layer. The present work shows the study of ZnO Schottky diodes based on conductive films of AZO and PEDOT: PSS as the ohmic and the Schottky contact, respectively. First, we deposited a ~10 nm thick Al layer over a glass substrate using the vacuum thermal evaporation technique. Afterward, we deposited/synthesized the ZnO by spray pyrolysis over the Al layer. This process resulted in the fabrication in situ of the AZO electrode and the deposition of the semiconductive ZnO film above the AZO. To complete the sandwiched architecture, the PEDOT: PSS film was deposited over the ZnO layer by spray coating. The behavior of the current as a function of the DC bias (I-V) was measured in the dark. The Schottky diode performance was analyzed by extracting parameters as the series resistance (Rs), ideality factor (n), and the Schottky barrier height (using Cheung’s method [2]. Also, we calculated the rectification ratio (RR) and the differential resistance (Ri). We found the following parameter values for the device: n ~2.14, Rs ~85 kO, ~0.93 eV, and RR ~2.61x10^2. I-V curves simulated by the finite difference method were also included to demonstrate the relation between the diode performance and the material parameters (e. g. mobility and doping density). Beyond the device characterization, our present contribution is a base for further studies of photosensors modified by metallic nanoparticles within the semiconductor layer. For example, the simulation shows that when gold nanoparticles (AuNP) are added to the ZnO volume, it promotes the absorption of ~521 nm and the surface plasmon resonance. This phenomenon expands the ZnO absorption range beyond the UVA, i.e., reaching the visible spectrum. References [1] M. S. Ozório et al., “AZO transparent electrodes grown in situ during the deposition of zinc acetate dihydrate onto aluminum thin film by spray pyrolysis,” J. Mater. Sci. Mater. Electron., vol. 30, no. 14, pp. 13454–13461, 2019. [2] S. K. Cheung and N. W. Cheung, “Extraction of Schottky diode parameters from forward current-voltage characteristics,” Appl. Phys. Lett., vol. 49, no. 2, pp. 85–87, 1986.

Título do Evento: Workshop INEO 2022
Título dos Anais do Evento: Anais do Workshop INEO 2022
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

BERTOLDO, Luis Henrique Tigre et al.. STUDY OF A HYBRID SCHOTTKY PHOTODIODE BASED ON ZNO AND PEDOT:PSS.. In: Anais do 16° Workshop do Instituto Nacional de Eletrônica Orgânica. Anais...São Carlos(SP) IFSC, 2022. Disponível em: https//www.even3.com.br/anais/workshopINEO2022/473379-STUDY-OF-A-HYBRID-SCHOTTKY-PHOTODIODE-BASED-ON-ZNO-AND-PEDOT-PSS. Acesso em: 09/12/2024