The Frozen Potential Approach to Separate the Photocurrent and Diode Injection Current in Solar Cells

Abstract

The principle of superposition is commonly utilized in the analysis of current transport under dark and light conditions for several different types of solar cells. However, this principle assumes that the photocurrent is voltage independent and that the diode injection current is generation independent, which restricts its validity. Indeed, the superposition principle cannot be applied to most thin-film solar cells because the above mentioned assumptions are not generally valid. In order to address this issue, a novel numerical modeling approach is described that allows independent computation of the photocurrent and of the diode injection current as components of the total current under illumination. Then, using several test cases, where the principle of superposition breaks down, the usefulness of this modeling approach is demonstrated.

A Physics-Based Analytical Model for Perovskite Solar Cells

“…Among these parameters, 𝐺 𝑚𝑎𝑥 is obtained by integrating the position-dependent photon absorption calculated by the transfer matrix method [28] (here q𝐺 𝑚𝑎𝑥 = 23 mA/cm 2 ); 𝐷 ≈ 0.05 cm 2 s −1 is known for the material system for both electron and hole [26]; 𝑉 𝑏𝑖 can be estimated either by using the capacitance-voltage characteristics [22] or by using the crossover voltage of the dark and light IV [29]. The effective surface recombination velocities can be fitted using the photogenerated current 𝐽 𝑝ℎ𝑜𝑡𝑜 (𝐺, 𝑉) = 𝐽 𝑙𝑖𝑔ℎ𝑡 (𝐺, 𝑉) − 𝐽 𝑑𝑎𝑟𝑘 (𝑉) [30]. Finally, we can obtain the dark diode current 𝐽 𝑓0/𝑏0 by fitting the dark current.…”

Device physics underlying silicon heterojunction and passivating‐contact solar cells: A topical review

“…Furthermore, J Tot involves two components, J Pho and J Diode (see ()), which need to be analyzed separately . Detailed analysis of these current components was carried out in . In the following section, we see that the circuit in Figure C works very well to explain SHJ cell transport.…”

“…To overcome this challenge, a numerical approach to study J Dark and J Tot must be adopted. Furthermore, J Tot involves two components, J Pho and J Diode (see ()), which need to be analyzed separately . Detailed analysis of these current components was carried out in .…”

Real‐time monitoring and diagnosis of photovoltaic system degradation only using maximum power point—the Suns‐Vmp method

“…The complete set of equations and parameter descriptions for the five parameters is summarized in the supplementary material (SI). If needed, the five parameter model can be generalized to include nonlinear shunt resistance [21] and temperature-and illumination-dependent series resistance [22], [23].…”