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Indoor photovoltaic power generation is to achieve the purpose of energy saving and environmental protection by absorbing and using the lights in life, and promote the development of the smart housing industry
.
Flexible Cu2ZnSn(S,Se)4 (CZTSSe) thin-film solar cells are environmentally friendly, low-cost, stable and efficient, and have huge development potential in the indoor photovoltaic market
Figure 1.
(a) Indoor photovoltaic application design of double-sided CZTSSe; (b) device photo and structure diagram
.
Image source: Nat.
The photovoltaic device has a double-sided symmetrical structure (Ag / ITO / ZnO / CdS / CZTSSe / MoSe2 / Mo / MoSe2 / CZTSSe / CdS / ZnO / ITO / Ag)
.
The key point of the device is that it uses a 60-micron thick, highly conductive Mo foil as the substrate, which is perfectly compatible with the traditional CZTSSe system and process.
Figure 2 (ac) Flexible CZTSSe battery front and back device performance; (df) device performance under low light
.
Image source: Nat.
Through the optimization of performance, the efficiency of the device on both sides under standard sunlight is 9.
3% and 9%, respectively.
The performance on both sides of the device is basically the same, and it is at the international leading level in the field of flexible CZTSSe thin film batteries
.
In order to adapt to the indoor application environment, the performance characteristics of the device under low light were tested.
Since Mo foil is a good conductor, the double-sided CZTSSe solar cells share the same substrate, which makes it easy to connect both ends in parallel
.
The front and back sides are respectively irradiated with 1 sunlight and 0.
This result was recently published on Nature Communications.