We directly grow a lattice matched GalnP/GalnAs/GalnNAs/Ge （1.88 eVil .42 eVil .05 eV/0.67eV） four-junction （4J） solar cell on a Ge substrate by the metal organic chemical vapor deposition technology. To solve the...We directly grow a lattice matched GalnP/GalnAs/GalnNAs/Ge （1.88 eVil .42 eVil .05 eV/0.67eV） four-junction （4J） solar cell on a Ge substrate by the metal organic chemical vapor deposition technology. To solve the current limit of the GalnNAs sub cell, we design three kinds of anti-reflection coatings and adjust the base region thickness of the GalnNAs sub cell. Developed by a series of experiments, the external quantum efficiency of the GalnNAs sub cell exceeds 80%, and its current density reaches 11.24 mA/cm2. Therefore the current limit of the 4J solar cell is significantly improved. Moreover, we discuss the difference of test results between 4J and GalnP/GalnAs/Ge solar cells under the 1 sun AMO spectrum.展开更多
GaInP/GaAs/Ge triple-junction solar cells were irradiated with 50 keV and 100 keV protons at fluences of 5 × 10^10 cm^-2, 1 × 10^11 cm^-2,1 × 10^12 cm^-2, and 1 × 10^13 cm^-2. Their performance deg...GaInP/GaAs/Ge triple-junction solar cells were irradiated with 50 keV and 100 keV protons at fluences of 5 × 10^10 cm^-2, 1 × 10^11 cm^-2,1 × 10^12 cm^-2, and 1 × 10^13 cm^-2. Their performance degradation is analyzed using current-voltage characteristics and spectral response measurements, and then the changes in Isc, Voc, Pmax and the spectral response of the cells are observed as functions of proton irradiation fluence and energy. The results show that the spectral response of the top cell degrades more significantly than that of the middle cell, and 100 keV proton-induced degradation rates of Isc, Voc and Pmax are larger compared with 50 keV proton irradiation.展开更多
The radiation damage of three individual subcells for GalnP/GaAs//Ge triple-junction solar cells irradiated with electrons and protons is investigated using photoluminescence （PL） measurements. The PL spectra of eac...The radiation damage of three individual subcells for GalnP/GaAs//Ge triple-junction solar cells irradiated with electrons and protons is investigated using photoluminescence （PL） measurements. The PL spectra of each subcell are obtained using different excitation lasers. The PL intensity has a fast degradation after irradiation, and decreases as the displacement damage dose increases. Furthermore, the normalized PL intensity varying with the displacement damage dose is analyzed in detail, and then the lifetime damage coefficients of the recombination centers for GaInP top-cell, GaAs mid-cell and Ge bottom-cell of the triple-junction solar cells are determined from the PL radiative efficiency.展开更多
Photoluminescence（PL） measurements are carried out to investigate the degradation of GaInP top cell and GaAs middle cell for GaInP/GaAs/Ge triple-junction solar cells irradiated with 1.0, 1.8 and 11.5 MeV electrons ...Photoluminescence（PL） measurements are carried out to investigate the degradation of GaInP top cell and GaAs middle cell for GaInP/GaAs/Ge triple-junction solar cells irradiated with 1.0, 1.8 and 11.5 MeV electrons with fluences ranging up to 3 × 10^15, 1 × 10^15 and 3 × 10^14 cm^-2, respectively. The degradation rates of PL intensity increase with the electron fluence and energy. Furthermore, the damage coefficient of minority carrier diffusion length is estimated by the PL radiative efficiency. The damage coefficient increases with the electron energy. The relation of damage coefficient to electron energy is discussed with the non-ionizing energy loss（NIEL）, which shows a quadratic dependence between damage coefficient and NIEL.展开更多
应用PC1D程序拟合1 Me V电子辐照后Ga In P/Ga As/Ge太阳电池的光谱响应得到少数载流子扩散长度随辐照电子注量的变化关系.结果表明:少数载流子(少子)扩散长度随辐照电子注量增加而减小,少数载流子扩散长度的缩短是太阳电池短路电流退...应用PC1D程序拟合1 Me V电子辐照后Ga In P/Ga As/Ge太阳电池的光谱响应得到少数载流子扩散长度随辐照电子注量的变化关系.结果表明:少数载流子(少子)扩散长度随辐照电子注量增加而减小,少数载流子扩散长度的缩短是太阳电池短路电流退化的主要原因.展开更多
Displacement damage dose (Dd) approach was applied to analyze the electron irradiation-induced degradation of GaInP/ GaAs/Ge space solar cells by effective 1 MeV electron Dd, the electron irradiation-induced maximum p...Displacement damage dose (Dd) approach was applied to analyze the electron irradiation-induced degradation of GaInP/ GaAs/Ge space solar cells by effective 1 MeV electron Dd, the electron irradiation-induced maximum power Pmax degradation of the solar cells is plotted as a function of the effective 1 MeV electron Dd , and the result shows that all the measured electron data can be represented by a single curve using displacement damage dose. Obviously, the displacement damage dose approach simplifies the description of electron irradiation-induced degradation of GaInP/GaAs/Ge space solar cells, and also offers an alternative for handling the case where degradation occurs as a result of combined electron and proton irradiation.展开更多
GalnP/GaAs/Ge tandem solar cells were fabricated by a MOCVD technique.The photoelectric properties of the solar cells were characterized by a current-voltage test method.The dependence of the solar cell’s characteris...GalnP/GaAs/Ge tandem solar cells were fabricated by a MOCVD technique.The photoelectric properties of the solar cells were characterized by a current-voltage test method.The dependence of the solar cell’s characteristics on temperature were investigated from 30 to 170°C at intervals of 20°C.Test results indicated that with increasing temperature,JSC of the cell increased slightly with a temperature coefficient of 9.8（μA/cm2）/°C.Voc reduced sharply with a coefficient of-5.6 mV/°C.FF was reduced with a temperature coefficient of—0.00063/℃. Furthermore,the conversion efficiency decreased linearly with increasing temperature which decreased from 28% at 30℃to 22.1%at 130°C.Also,detailed theoretical analyses for temperature characteristics of the solar cell were given.展开更多
A typical GaInP/GaInAs/Ge tandem solar cell structure operating under AM0 illumination is proposed, and the current-voltage curves are calculated for different recombination velocities at both front and back-surfaces ...A typical GaInP/GaInAs/Ge tandem solar cell structure operating under AM0 illumination is proposed, and the current-voltage curves are calculated for different recombination velocities at both front and back-surfaces of the three subcells by using a theoretical model including optical and electrical modules.It is found that the surface recombination at the top GaInP cell is the main limitation for obtaining high efficiency tandem solar cells.展开更多
文摘We directly grow a lattice matched GalnP/GalnAs/GalnNAs/Ge （1.88 eVil .42 eVil .05 eV/0.67eV） four-junction （4J） solar cell on a Ge substrate by the metal organic chemical vapor deposition technology. To solve the current limit of the GalnNAs sub cell, we design three kinds of anti-reflection coatings and adjust the base region thickness of the GalnNAs sub cell. Developed by a series of experiments, the external quantum efficiency of the GalnNAs sub cell exceeds 80%, and its current density reaches 11.24 mA/cm2. Therefore the current limit of the 4J solar cell is significantly improved. Moreover, we discuss the difference of test results between 4J and GalnP/GalnAs/Ge solar cells under the 1 sun AMO spectrum.
基金supported by National Natural Science Foundation of China(Nos.10675023,11075018)the Fundamental Research Funds for the Central Universities of China
文摘GaInP/GaAs/Ge triple-junction solar cells were irradiated with 50 keV and 100 keV protons at fluences of 5 × 10^10 cm^-2, 1 × 10^11 cm^-2,1 × 10^12 cm^-2, and 1 × 10^13 cm^-2. Their performance degradation is analyzed using current-voltage characteristics and spectral response measurements, and then the changes in Isc, Voc, Pmax and the spectral response of the cells are observed as functions of proton irradiation fluence and energy. The results show that the spectral response of the top cell degrades more significantly than that of the middle cell, and 100 keV proton-induced degradation rates of Isc, Voc and Pmax are larger compared with 50 keV proton irradiation.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10675023,11075018,11375028 and 11675020the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No 20120003110011
文摘The radiation damage of three individual subcells for GalnP/GaAs//Ge triple-junction solar cells irradiated with electrons and protons is investigated using photoluminescence （PL） measurements. The PL spectra of each subcell are obtained using different excitation lasers. The PL intensity has a fast degradation after irradiation, and decreases as the displacement damage dose increases. Furthermore, the normalized PL intensity varying with the displacement damage dose is analyzed in detail, and then the lifetime damage coefficients of the recombination centers for GaInP top-cell, GaAs mid-cell and Ge bottom-cell of the triple-junction solar cells are determined from the PL radiative efficiency.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11675020,11375028,11075018 and 10675023
文摘Photoluminescence（PL） measurements are carried out to investigate the degradation of GaInP top cell and GaAs middle cell for GaInP/GaAs/Ge triple-junction solar cells irradiated with 1.0, 1.8 and 11.5 MeV electrons with fluences ranging up to 3 × 10^15, 1 × 10^15 and 3 × 10^14 cm^-2, respectively. The degradation rates of PL intensity increase with the electron fluence and energy. Furthermore, the damage coefficient of minority carrier diffusion length is estimated by the PL radiative efficiency. The damage coefficient increases with the electron energy. The relation of damage coefficient to electron energy is discussed with the non-ionizing energy loss（NIEL）, which shows a quadratic dependence between damage coefficient and NIEL.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10675023 and 11075018)the Fundamental Research Funds for the Central Universities
文摘Displacement damage dose (Dd) approach was applied to analyze the electron irradiation-induced degradation of GaInP/ GaAs/Ge space solar cells by effective 1 MeV electron Dd, the electron irradiation-induced maximum power Pmax degradation of the solar cells is plotted as a function of the effective 1 MeV electron Dd , and the result shows that all the measured electron data can be represented by a single curve using displacement damage dose. Obviously, the displacement damage dose approach simplifies the description of electron irradiation-induced degradation of GaInP/GaAs/Ge space solar cells, and also offers an alternative for handling the case where degradation occurs as a result of combined electron and proton irradiation.
基金supported by Doctoral Initial Fund of Be ijing University of Technology,China(No.X0006015201101)the National Natural Foundation of China(No.10804005)
文摘GalnP/GaAs/Ge tandem solar cells were fabricated by a MOCVD technique.The photoelectric properties of the solar cells were characterized by a current-voltage test method.The dependence of the solar cell’s characteristics on temperature were investigated from 30 to 170°C at intervals of 20°C.Test results indicated that with increasing temperature,JSC of the cell increased slightly with a temperature coefficient of 9.8（μA/cm2）/°C.Voc reduced sharply with a coefficient of-5.6 mV/°C.FF was reduced with a temperature coefficient of—0.00063/℃. Furthermore,the conversion efficiency decreased linearly with increasing temperature which decreased from 28% at 30℃to 22.1%at 130°C.Also,detailed theoretical analyses for temperature characteristics of the solar cell were given.
文摘A typical GaInP/GaInAs/Ge tandem solar cell structure operating under AM0 illumination is proposed, and the current-voltage curves are calculated for different recombination velocities at both front and back-surfaces of the three subcells by using a theoretical model including optical and electrical modules.It is found that the surface recombination at the top GaInP cell is the main limitation for obtaining high efficiency tandem solar cells.
