Abstract

Transport properties of photo-induced charge carriers through different grains in the polycrystalline photovoltaic devices strongly depend on the microstructural pattern of the active layers. Therefore, photocurrent mapping with nanoscale resolution is important to know about the electrical responses of the different grains in the polycrystalline photovoltaic devices. Here, we have used photoconductive atomic force microscopy for mapping the photocurrent with nanoscale resolution of two types of ZnO nanorods/Cu2O based solar cells. The morphology and current have been measured simultaneously with nanoscale resolution from the top surfaces of the devices at different applied voltages. It is demonstrated that the nanostructure of the active layers is one of the most important variables determining device performances. Different local photovoltaic performances have been observed from these two devices due to various microstructural and electrical phenomena of their seed layers. On the other hand, significant variations in short-circuit current have been observed from different grains of the devices which appeared more alike in the micrograph owing to various transport properties of photocarriers. It is observed that the grain boundaries are more preferable for charge collection over the grain interiors. It shows a higher short circuit current close to the boundary than the grain inside. This study illustrates an important area for future fundamental research to enhance the performances of the polycrystalline photovoltaic devices through better control of morphology and improving the inherent properties of the active layers.

Original languageEnglish
Pages (from-to)310-317
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume176
DOIs
Publication statusPublished - 1 Mar 2018

Fingerprint

Induced currents
Oxides
Solar cells
Photocurrents
Short circuit currents
Transport properties
Charge carriers
Nanorods
Seed
Atomic force microscopy
Nanostructures
Grain boundaries
Electric potential

Keywords

  • Nanoscale resolution
  • Photoconductive AFM
  • Photoresponse
  • Seed layer
  • ZnO nanorods/CuO

Cite this

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title = "Light-induced current mapping in oxide based solar cells with nanoscale resolution",
abstract = "Transport properties of photo-induced charge carriers through different grains in the polycrystalline photovoltaic devices strongly depend on the microstructural pattern of the active layers. Therefore, photocurrent mapping with nanoscale resolution is important to know about the electrical responses of the different grains in the polycrystalline photovoltaic devices. Here, we have used photoconductive atomic force microscopy for mapping the photocurrent with nanoscale resolution of two types of ZnO nanorods/Cu2O based solar cells. The morphology and current have been measured simultaneously with nanoscale resolution from the top surfaces of the devices at different applied voltages. It is demonstrated that the nanostructure of the active layers is one of the most important variables determining device performances. Different local photovoltaic performances have been observed from these two devices due to various microstructural and electrical phenomena of their seed layers. On the other hand, significant variations in short-circuit current have been observed from different grains of the devices which appeared more alike in the micrograph owing to various transport properties of photocarriers. It is observed that the grain boundaries are more preferable for charge collection over the grain interiors. It shows a higher short circuit current close to the boundary than the grain inside. This study illustrates an important area for future fundamental research to enhance the performances of the polycrystalline photovoltaic devices through better control of morphology and improving the inherent properties of the active layers.",
keywords = "Nanoscale resolution, Photoconductive AFM, Photoresponse, Seed layer, ZnO nanorods/CuO",
author = "Shrabani Panigrahi and Tom{\'a}s Calmeiro and Rodrigo Martins and Elvira Fortunato",
note = "info:eu-repo/grantAgreement/FCT/5876/147333/PT# This study was funded by the European Commission under the FP7 All Oxide PV project {"}Novel Composite Oxides by Combinatorial Material Synthesis for Next Generation All-Oxide-Photovoltaics{"} number 309018 and the FP7 ERC AdG project {"}Transparent Electronics{"} number 228144. This work was partially supported by FEDER funds through the COMPETE 202. Sem PDF conforme despacho.",
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AU - Panigrahi, Shrabani

AU - Calmeiro, Tomás

AU - Martins, Rodrigo

AU - Fortunato, Elvira

N1 - info:eu-repo/grantAgreement/FCT/5876/147333/PT# This study was funded by the European Commission under the FP7 All Oxide PV project "Novel Composite Oxides by Combinatorial Material Synthesis for Next Generation All-Oxide-Photovoltaics" number 309018 and the FP7 ERC AdG project "Transparent Electronics" number 228144. This work was partially supported by FEDER funds through the COMPETE 202. Sem PDF conforme despacho.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Transport properties of photo-induced charge carriers through different grains in the polycrystalline photovoltaic devices strongly depend on the microstructural pattern of the active layers. Therefore, photocurrent mapping with nanoscale resolution is important to know about the electrical responses of the different grains in the polycrystalline photovoltaic devices. Here, we have used photoconductive atomic force microscopy for mapping the photocurrent with nanoscale resolution of two types of ZnO nanorods/Cu2O based solar cells. The morphology and current have been measured simultaneously with nanoscale resolution from the top surfaces of the devices at different applied voltages. It is demonstrated that the nanostructure of the active layers is one of the most important variables determining device performances. Different local photovoltaic performances have been observed from these two devices due to various microstructural and electrical phenomena of their seed layers. On the other hand, significant variations in short-circuit current have been observed from different grains of the devices which appeared more alike in the micrograph owing to various transport properties of photocarriers. It is observed that the grain boundaries are more preferable for charge collection over the grain interiors. It shows a higher short circuit current close to the boundary than the grain inside. This study illustrates an important area for future fundamental research to enhance the performances of the polycrystalline photovoltaic devices through better control of morphology and improving the inherent properties of the active layers.

AB - Transport properties of photo-induced charge carriers through different grains in the polycrystalline photovoltaic devices strongly depend on the microstructural pattern of the active layers. Therefore, photocurrent mapping with nanoscale resolution is important to know about the electrical responses of the different grains in the polycrystalline photovoltaic devices. Here, we have used photoconductive atomic force microscopy for mapping the photocurrent with nanoscale resolution of two types of ZnO nanorods/Cu2O based solar cells. The morphology and current have been measured simultaneously with nanoscale resolution from the top surfaces of the devices at different applied voltages. It is demonstrated that the nanostructure of the active layers is one of the most important variables determining device performances. Different local photovoltaic performances have been observed from these two devices due to various microstructural and electrical phenomena of their seed layers. On the other hand, significant variations in short-circuit current have been observed from different grains of the devices which appeared more alike in the micrograph owing to various transport properties of photocarriers. It is observed that the grain boundaries are more preferable for charge collection over the grain interiors. It shows a higher short circuit current close to the boundary than the grain inside. This study illustrates an important area for future fundamental research to enhance the performances of the polycrystalline photovoltaic devices through better control of morphology and improving the inherent properties of the active layers.

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