Ultra-high Open-circuit Voltage of Perovskite Solar Cells Induced by Nucleation Thermodynamics on Rough Substrates

Overview

Journal Sci Rep

Specialty Science

Date 2017 Apr 13

PMID 28401890

Citations 12

Authors

Yan Li

Bin Ding

Qian-Qian Chu

Guan-Jun Yang

Mingkui Wang

Chang-Xin Li

Chang-Jiu Li

Affiliations

Soon will be listed here.

Abstract

To obtain high performance CHNHPbI perovskite solar cells, it is highly important to realise a high open-circuit voltage. Calculation results based on a modified diode model have indicated that a low bare ratio ϕ of the perovskite film is the most important factor determining the open-circuit voltage, where ϕ is defined as the ratio of the projection of the uncovered area of the perovskite film to the apparent area of the total substrate surface. To realise a low ϕ, we investigate the nucleation behaviour of crystals on rough substrates. The analysis results predict that, when CHNHPbI is deposited on conventional transparent conductive oxide substrates such as fluorine-doped tin oxide, preferential heterogeneous nucleation will occur on the concave regions of the substrate; then, depending on the subsequent growth step, full coverage of the perovskite film at both the macroscopic and microscopic scales is realised. As a result, an ultra-high open-circuit voltage, i.e., 1.20 V, can be achieved in devices using the full coverage CHNHPbI film. The thermodynamics theory of precipitation nucleation should shed light on solution engineering of thin films.

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