In the 6^th emerging PV report, the efficiency of single junction perovskite (circles), organic (hexagons), dye sensitized (pentagons), kesterite (diamonds), Sb₂Se₃ (right triangle), and AgBiS₂ (left triangles) solar cells at the emerging-pv.org database was analyzed considering data over the last decade.

The flexible Photovoltaic fatigue factor (F) quantifies mechanical and photovoltaic performance as a function of the power conversion efficiency (PCE), the strain (), and the number of bending cycles (N_BC) in bending tests. The strain depends on the bending radius (R) and the thicknesses of the substrate (t_s) and the photovoltaic device (t_d).

In the 5^th emerging PV report, Rau’s logarithmic loss analysis shows perovskite solar cells (PSCs) at 86% of their detailed balance efficiency limit (DBEL), only second to Gallium Arsenide cells. Organic solar cells (OPV) reach 61% of their DBEL, in the sixth position, after inorganic thin film cadmium telluride and CIGS. Matildite (AgBiS₂) solar cells are 31% of their DBEL.

The 4^th emerging PV reports (e-PVr) presented a summary of approaches to classify PV technologies and concepts based on their age, technology readiness as well as cost and efficiency potential. The “PV wave” term was first time introduced within the context of the discussion between the colloquial use of the “PV generation” term and the original definition by M. Green in the decade of 2000.

The 3rd installment of the “Emerging PV reports” continues presenting and analyzing the best research achievements in the performance of emerging single-junction and monolithic multijunction solar cells, as reported in peer-reviewed articles in academic journals since August 2021. In this installment, for the first time, AgBiS₂ and triple junction cells are considered.

The 2nd instalment of the “Emerging PV reports” continues presenting and analyzing the best research achievements in the performance of emerging single-junction and monolithic tandem solar cells, as reported in peer-reviewed articles in academic journals since August 2020.

External quantum efficiency spectra are parameterized through the sigmoid function for reporting the bandgap energy (Eg) and the sigmoid wavelength range (λs), which quantify the steepness of the absorption onset. Large values of λs indicate significant photovoltage losses and produce particularly high short-circuit currents for some ranges of Eg, regarding the Shockley–Queisser model.

The first survey of the emerging photovoltaic reports initiative summarizes the best achievements published in academic journals in the research of emerging photovoltaic materials, e.g., organic, perovskite, and dye sensitized solar cells. The reports are presented as a function of the bandgap energy for different categories such as transparency, flexibility, and stability, and compared to the Shockley–Queisser limit.

The study of the light utilization efficiency (LUE), photon balance check, average visible transmittance (AVT) and color rendering index (CRI) are key for good practices in characterization of transparent solar cells.