Fundamentals of the “lock-in” technique and its application to solar cell characterization

CHEETAH Webinar

Lock-in amplifiers are widely used for electrical characterization in semiconductor technology. Whereas this is a very powerful detection technique, knowledge of the fundamentals of the lock-in is essential in order to benefit from all its detection potential. In this webinar, we will review the fundamentals of the “lock-in” technique, explaining the different stages of lock-in detection (modulation, amplification, mixing, demodulation, and filtering). We will learn particular concepts related to lock-in measurements, such as dynamic reserve, phase-sensitive detection, time constant, etc. We will learn how to operate a real (in the market) lock-in device.

Lock-in amplifiers are an indispensable tool for various solar cell characterization techniques. In this seminar, we will study its application to measuring quantum efficiency. We will describe the basics of this important characterization technique, explaining to new users how to avoid common mistakes (second-order filtering, placement of the chopper, quantitative analysis, etc.).

Informations

Contacts to get more information on this event:

Dr.	Carlos del Cañizo	UPM-IES
Dr.	Kartsen Bittkau,	FZ-Jülich
Dr.	Franco Roca,	ENEA

Technical information to register/login

CHEETAH Webinar team

Agenda

Time	Title	Speakers
11:00-11:05	Introduction	DEL CAÑIZO Carlos
Prof. Carlos Del  Cañizo introduces CHEETAH project, the webinar and the speaker DEL CAÑIZO Carlos Introduction (FLV video) Introduction (slides)
11:05-12:00	Fundamentals of the “lock-in” technique and its application to solar cell characterization.	RAMIRO GONZÁLEZ Iñigo
In this webinar Dr. Iñigo Ramiro reviews  the fundamentals of the “lock-in” technique, explaining the different stages of lock-in detection (modulation, amplification, mixing, demodulation, and filtering). We will learn particular concepts related to lock-in measurements, such as dynamic reserve, phase-sensitive detection, time constant, etc. We will learn how to operate a real (in the market) lock-in device. He will intrioduce its application to measuring quantum efficiency, and how to avoid common mistakes (second-order filtering, placement of the chopper, quantitative analysis, etc.) RAMIRO GONZÁLEZ Iñigo Presentation (FLV Video) Presentation (MP4 Video) Presentation (slides) Equipment : Lock-in amplifier PV Technologies : Material and Device Characterization Tags : I-V characterization & Spectral response
12:00-12:15	Questions and comments