Advances in screen printing metallization for a-Si:H/c-Si heterojunction solar cells

Luca Serenelli, Michele Miliciani, Massimo Izzi, Rosa Chierchia, Alberto Mittiga, Mario Tucci

Research output: Contribution to conferencePaper

10 Citations (Scopus)

Abstract

Amorphous / crystalline silicon heterojunction is the most attractive technique to obtain high efficiency solar cells. Usually such a kind of cells is produced starting from n-type silicon wafers, because of several advantages, like the high bulk lifetime and the possibility to easily contact the n-type base with i-n amorphous layers. The emitter is usually covered by Transparent Conductive Oxides (TCO) which works as high conductive layer and Anti Reflection Coating (ARC). The device is completed by a metal grid, made by screen printed silver, sintered at low temperature. Both the TCO and the grid strongly influence the final cell series resistance, and consequently the cell efficiency. When p-type wafer is adopted as substrate for heterojunction cell, the base contact is more difficult to obtain because of the energy bands alignment between the c-Si and the p-type a-Si:H layer. Recently n-type doped SiOx layer has attracted interest as emitter layer in heterojunction device, therefore in this work we show the results obtained on the metallization of n-type SiOx/ptype c-Si heterojunction solar cells by means of low temperature screen printing technique. In particular a new kind of low temperature sintering (< 200°C) screen printable silver paste has been developed able to ensure high linear conductivity, low specific contact resistivity and strong adhesion to TCO's. We present electrical characterization using Transfer Length Method (TLM) technique. Since the base contact of SiOx/c-Si heterojunction is ensured by laser doping technique starting from p-type a-Si:H layer, we also show how the screen printed Ag paste can enhance the base contact of this solar cell
Original languageEnglish
DOIs
Publication statusPublished - 15 Oct 2014
Event40th IEEE Photovoltaic Specialist Conference, PVSC 2014 - Denver, United States
Duration: 15 Oct 2014 → …

Conference

Conference40th IEEE Photovoltaic Specialist Conference, PVSC 2014
CountryUnited States
CityDenver
Period15/10/14 → …

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Serenelli, L., Miliciani, M., Izzi, M., Chierchia, R., Mittiga, A., & Tucci, M. (2014). Advances in screen printing metallization for a-Si:H/c-Si heterojunction solar cells. Paper presented at 40th IEEE Photovoltaic Specialist Conference, PVSC 2014, Denver, United States. https://doi.org/10.1109/PVSC.2014.6925445