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Progress in the understanding of light‐ and elevated temperature‐induced degradation in silicon solar cells: A review
Author(s) -
Chen Daniel,
Vaqueiro Contreras Michelle,
Ciesla Alison,
Hamer Phillip,
Hallam Brett,
Abbott Malcolm,
Chan Catherine
Publication year - 2021
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.3362
Subject(s) - cost of electricity by source , degradation (telecommunications) , wafer , silicon , process engineering , root cause , doping , materials science , solar cell , crystalline silicon , engineering physics , environmental science , computer science , biochemical engineering , nanotechnology , reliability engineering , electricity generation , optoelectronics , telecommunications , engineering , power (physics) , physics , quantum mechanics
Abstract At present, the commercially dominant and rapidly expanding PV‐device technology is based on the passivated emitter and rear cell (PERC) design developed at UNSW. However, this technology has been found to suffer from a carrier‐induced degradation commonly referred to as ‘light‐ and elevated temperature‐induced degradation’ (LeTID) and can result in up to 16% relative performance losses. LeTID was recently shown to occur in almost every type of silicon wafer, independent of the doping material. Even though the degradation mechanism is known to recover under normal operation conditions, it is a lengthy process that drastically affects the energy yield, stability and, ultimately, the levelized cost of electricity (LCOE) of installed systems. Despite the joint effort of many research groups, the root cause of the degradation is still unknown. Here, we provide an overview of the existing literature and describe key LeTID characteristics and how these have led to the development of various theories of the underlying mechanism. Further, given the continuously appearing and strong evidence of hydrogen involvement in LeTID, many mitigation methods concerning hydrogenation have been suggested. We discuss such reported methods, bearing in mind crucial consumer necessities in terms of sustained cell performance and minimised LCOE.