AK-140 Triple Junction Reference Cell (bottom)

Used to accurately calibrate solar simulator intensity for the bottom layer of triple junction type cells. Can be used individually or with the AK-120(top) and  AK-130(middle) reference cells for triple junction type cells.
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AK-140 Triple Junction Reference Cell

AK-140 Triple Junction Reference Cell (bottom)

The AK-140 is used to calibrate intensity of solar simulators used for bottom of triple junction category cells. These accurate instruments are available for use for triple junction type cells individually or in conjunction with reference cells AK-130 (middle) and AK-120 (top).

Spotlight on solar cells, including photovoltaic cells, is increasing along with the continuing focus that’s placed on renewable energy. Companies that want to remain at the top of the industry can do so by continuing to better their solar cells performance levels. Getting accurate measurements from instruments is key. To achieve this, a reference photovoltaic cell must be used. The cell should have a calibrated short circuit current so the intensity of the solar simulator used for measurements is adjusted.

The Konica Minolta Sensing PV Reference Cells (Filtered) can be delivered with calibration traceable to AIST. The reference cells have designs that are amongst the industries most stable and accurate (in accordance with JIS C8904). In addition to being ready for use as soon as they are unboxed, the AK series reference PV cells operate with a PT-100 temperature sensor. They also work with a short circuit current (lsc) test report. Used as a standalone or with other reference cells, the AK-140 works with the AK-130 and the AK-120 for triple junction cells.


AK-140 Triple Junction Reference Cell (bottom)

Spectral mismatch error of less than 1%

By employing the high-accuracy optical filter technology cultivated for our color-measuring instruments, we have succeeded in greatly reducing spectral mismatch, which had been a major problem with conventional cells. Spectral mismatch can be suppressed to 1% or less, even when evaluating solar cell performance using JIS C-8942 Class C solar simulators.

Improved durability against solar simulator light

Standard reference cells using optical filters typically have low durability against exposure to solar simulator light.  This causes changes in characteristics due to the effects of light exposure (solarization) making accurate measurements difficult. AK series Reference PV Cells have a high durability against exposure to light, greatly reducing solarization and ensuring stability.

Improved reflection characteristics

Error in short-circuit current (Isc) due to multiple reflection is greatly reduced. Improvements in the optical structure suppress multiple reflections and reduce the 1.3% error of conventional products to 0.0%.

Maintain standard test condition of 25°C

A PT-100 temperature sensor is integrated into the package of the AK series cells, and can be connected to a temperature-controlled stage for reference PV cells to easily achieve and maintain the standard test condition (STC) of 25°C.

Calibration Certificate

A calibration certificate traceable to the National Renewable Energy Lab in the United States or Japan’s National Institute of Advanced Industrial Science and Technology is available as an optional accessory

Software for calculation of spectral mismatch

Every AK series cell includes our Spectral Mismatch Software.  The software can be used to determine the spectral mismatch between the AK Series PV Cell and any manufactured solar cell.  The software is available for download as a trial from our website.

Spectral mismatch calculation software download (free)


AK-140 Triple Junction Reference Cell (bottom)

Model AK-140
Spectral mismatch error * Within ±1%
Short-circuit current (Isc) at 25°±1°C 10 mA or higher
Receptor area 20 × 20 mm
Aperture area 47 × 47 mm
FOV 160°
FF 65% or higher
Temperature sensor PT-100
Connector for I-V measurement XLR-type Cannon plug (JIS standard)
Connector for temperature measurement LEMO connector (WPVS standard)
Operating temperature/ humidity range 20 to 30°C, relative humidity 65% or less
Storage temperature/ humidity range 15 to 30°C, relative humidity 30 to 75% with no condensation
Size (W × D × H) 120 × 90 × 21.5 mm
Weight 600 g
Short-circuit current Short-circuit current values measured under Konica Minolta standard test method are listed in the included test report
Standard accessories Storage Case PV-A01, M4 screws (4pcs), Connector for I-V Measurement (male) PV-A02, Protection Plate PV-A03, Test Report, Inspection Report
Optional Calibration Calibration Certificate (AIST Traceable)
* Spectral mismatch error evaluated according to Konica Minolta standard test conditions


AK-140 Triple Junction Reference Cell (bottom)

Included Accessories

Spectral Mismatch Software
Spectral Mismatch Software

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Suggested Accessories

Reference Cell Temperature Controller
Reference Cell Temperature Controller

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AK-140 Triple Junction Reference Cell (bottom)

Catalog Download: Download PDF (2.1MB)